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      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143199">Small-Cap Value Fund</rr:RiskReturnHeading>
    <rr:ObjectiveHeading
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143200"> 
 Investment Objective(s)</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-361">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The fund seeks long-term 
capital growth by investing primarily in small companies whose common stocks are believed to be undervalued.&lt;/p&gt;</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143202">Fees 
and Expenses</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-364">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:bold; text-decoration:none;"&gt;This 
table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the fund. 
You may also incur brokerage commissions and other charges when buying or selling shares of the fund, 
which are not reflected in the table or example below.&lt;/p&gt;</rr:ExpenseNarrativeTextBlock>
    <rr:ShareholderFeesCaption
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143203">Shareholder 
fees (fees paid directly from your investment)</rr:ShareholderFeesCaption>
    <rr:MaximumAccountFee
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="_17_"
      unitRef="usd">20</rr:MaximumAccountFee>
    <rr:MaximumAccountFee
      contextRef="Context_20241231_20241231_C000159683Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143205"
      unitRef="usd">0</rr:MaximumAccountFee>
    <rr:MaximumAccountFee
      contextRef="Context_20241231_20241231_C000005511Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143206"
      unitRef="usd">0</rr:MaximumAccountFee>
    <rr:MaximumAccountFee
      contextRef="Context_20241231_20241231_C000219318Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143207"
      unitRef="usd">0</rr:MaximumAccountFee>
    <rr:OperatingExpensesCaption
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143208">Annual 
fund operating expenses (expenses that you pay each 
year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143210"
      unitRef="pure">0.0063</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="Context_20241231_20241231_C000159683Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143211"
      unitRef="pure">0.0063</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="Context_20241231_20241231_C000005511Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143212"
      unitRef="pure">0.0063</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="Context_20241231_20241231_C000219318Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143213"
      unitRef="pure">0.0063</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143214"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20241231_20241231_C000159683Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143215"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20241231_20241231_C000005511Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143216"
      unitRef="pure">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20241231_20241231_C000219318Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143217"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143218"
      unitRef="pure">0.0014</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="Context_20241231_20241231_C000159683Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143219"
      unitRef="pure">0.0003</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="Context_20241231_20241231_C000005511Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143220"
      unitRef="pure">0.0028</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="Context_20241231_20241231_C000219318Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143221"
      unitRef="pure">0.0001</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143222"
      unitRef="pure">0.0077</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="Context_20241231_20241231_C000159683Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143223"
      unitRef="pure">0.0066</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="Context_20241231_20241231_C000005511Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143224"
      unitRef="pure">0.0116</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="Context_20241231_20241231_C000219318Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143225"
      unitRef="pure">0.0064</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143226"
      unitRef="pure">0</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20241231_20241231_C000159683Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143227"
      unitRef="pure">0</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20241231_20241231_C000005511Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143228"
      unitRef="pure">0</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20241231_20241231_C000219318Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="_40_"
      unitRef="pure">-0.0064</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143230"
      unitRef="pure">0.0077</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="Context_20241231_20241231_C000159683Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143231"
      unitRef="pure">0.0066</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="Context_20241231_20241231_C000005511Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143232"
      unitRef="pure">0.0116</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="Context_20241231_20241231_C000219318Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="_44_"
      unitRef="pure">0.0000</rr:NetExpensesOverAssets>
    <rr:ExpenseExampleHeading
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143234">Example</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143235">This example is 
intended to help you compare the cost of investing in the fund with the cost of investing in other mutual 
funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then 
redeem all of your shares at the end of those periods, that your investment has a 5% return each year, 
and that the fund&#x2019;s operating expenses remain the same. The example also assumes that any current expense 
limitation arrangement remains in place for the period noted in the previous table; therefore, the figures 
have been adjusted to reflect fee waivers or expense reimbursements only in the periods for which the 
expense limitation arrangement is expected to continue. Although your actual costs may be higher or lower, 
based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143236"
      unitRef="usd">79</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143237"
      unitRef="usd">246</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143238"
      unitRef="usd">428</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143239"
      unitRef="usd">954</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="Context_20241231_20241231_C000159683Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143240"
      unitRef="usd">67</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="Context_20241231_20241231_C000159683Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143241"
      unitRef="usd">211</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="Context_20241231_20241231_C000159683Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143242"
      unitRef="usd">368</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="Context_20241231_20241231_C000159683Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143243"
      unitRef="usd">822</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="Context_20241231_20241231_C000005511Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143244"
      unitRef="usd">118</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="Context_20241231_20241231_C000005511Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143245"
      unitRef="usd">368</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="Context_20241231_20241231_C000005511Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143246"
      unitRef="usd">638</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="Context_20241231_20241231_C000005511Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143247"
      unitRef="usd">1409</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="Context_20241231_20241231_C000219318Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143248"
      unitRef="usd">0</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="Context_20241231_20241231_C000219318Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143249"
      unitRef="usd">0</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="Context_20241231_20241231_C000219318Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143250"
      unitRef="usd">0</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="Context_20241231_20241231_C000219318Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143251"
      unitRef="usd">0</rr:ExpenseExampleYear10>
    <rr:PortfolioTurnoverTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-908">&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:bold; text-decoration:none;"&gt;Portfolio Turnover  The fund pays transaction 
costs, such as commissions, when it buys and sells securities (or &#x201c;turns over&#x201d; its portfolio). A 
higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when 
the fund&#x2019;s shares are held in a taxable account. These costs, which are not reflected in annual fund 
operating expenses or in the example, affect the fund&#x2019;s performance. During the most recent fiscal 
year, the fund&#x2019;s portfolio turnover rate was 32.4% of the average value of its portfolio.&lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverHeading
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143252">Portfolio Turnover</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverRate
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143253"
      unitRef="pure">0.324</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143254">Principal Investment Strategies</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-912">&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The fund normally invests 
at least 80% of its net assets (plus any borrowings for investment purposes) in companies with a market 
capitalization that is within or below the range of companies in the Russell 2000&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;&lt;sup&gt;&#xae;&lt;/sup&gt;&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; Index. Any derivatives 
that provide exposure to the investment focus suggested by the fund&#x2019;s name, or to one or more market 
risk factors associated with the investment focus suggested by the fund&#x2019;s name, are counted (as applicable) 
toward compliance with the fund&#x2019;s 80% investment policy. &lt;/span&gt;&lt;/p&gt;&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;As of December&#160;31, 2024, the market capitalization 
range for the Russell 2000&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;&lt;sup&gt;&#xae;&lt;/sup&gt;&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; Index was approximately $8.22&#160;million 
to $14.77&#160;billion. The market capitalization of the companies in the index changes over time and the 
index is periodically reconstituted to ensure that it continues to accurately reflect the small-cap equity 
market. The fund may, on occasion, purchase companies with a market capitalization above the range. &lt;/span&gt;&lt;/p&gt;&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
fund seeks the stocks of companies whose current stock prices do not appear to adequately reflect their 
underlying value as measured by assets, earnings, cash flow, or business franchises. In taking a value 
approach to investing, the adviser&#x2019;s in-house research team seeks to identify companies that appear 
to be undervalued by various measures, and may be temporarily out of favor, but have good prospects for 
capital appreciation. In selecting investments, the adviser generally looks for one or more of the following:&lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; text-indent:-8.65pt; font-weight:normal; margin-left:8.65pt; font-style:normal;"&gt;&lt;span style="font-size:7.0pt; font-family:Symbol; font-style:normal; font-weight:normal; text-decoration:none;"&gt;&#xb7;&lt;/span&gt;&lt;span style="word-spacing:5.325pt;"&gt;&#160;&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;low 
price/earnings, price/book value, or price/cash flow ratios relative to the Russell 2000&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;&lt;sup&gt;&#xae;&lt;/sup&gt;&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
Index, a company&#x2019;s peers, or a company&#x2019;s historical norm;&lt;/span&gt;&lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; text-indent:-8.65pt; font-weight:normal; margin-left:8.65pt; font-style:normal;"&gt;&lt;span style="font-size:7.0pt; font-family:Symbol; font-style:normal; font-weight:normal; text-decoration:none;"&gt;&#xb7;&lt;/span&gt;&lt;span style="word-spacing:5.325pt;"&gt;&#160;&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;low stock price relative to a company&#x2019;s underlying asset 
values;&lt;/span&gt;&lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; text-indent:-8.65pt; font-weight:normal; margin-left:8.65pt; font-style:normal;"&gt;&lt;span style="font-size:7.0pt; font-family:Symbol; font-style:normal; font-weight:normal; text-decoration:none;"&gt;&#xb7;&lt;/span&gt;&lt;span style="word-spacing:5.325pt;"&gt;&#160;&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;above-average 
dividend yield relative to a company&#x2019;s peers or its own historical norm;&lt;/span&gt;&lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; text-indent:-8.65pt; font-weight:normal; margin-left:8.65pt; font-style:normal;"&gt;&lt;span style="font-size:7.0pt; font-family:Symbol; font-style:normal; font-weight:normal; text-decoration:none;"&gt;&#xb7;&lt;/span&gt;&lt;span style="word-spacing:5.325pt;"&gt;&#160;&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;a plan to improve the business through restructuring; and/or&lt;/span&gt;&lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; text-indent:-8.65pt; font-weight:normal; margin-left:8.65pt; font-style:normal;"&gt;&lt;span style="font-size:7.0pt; font-family:Symbol; font-style:normal; font-weight:normal; text-decoration:none;"&gt;&#xb7;&lt;/span&gt;&lt;span style="word-spacing:5.325pt;"&gt;&#160;&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;a 
sound balance sheet and other positive financial characteristics.&lt;/span&gt;&lt;/p&gt;&lt;span style="-sec-ix-redline:true;"&gt;&#160;&lt;/span&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;At 
times, the fund may have a significant portion of its assets invested in the same economic sector, such 
as the financial sector. &lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;While most assets are typically invested in U.S. common stocks, including real 
estate investment trusts (REITs) that pool money to invest in properties and mortgages, the fund may 
invest in foreign stocks in keeping with its objective(s). &lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The fund&#x2019;s investments may include holdings 
in privately held companies and companies that only recently began to trade publicly.&lt;/p&gt;</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143255">Principal 
Risks</rr:RiskHeading>
    <rr:RiskTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_RiskLoseMoneyMember_S000002121Summary1Member"
      id="ixv-143256"> The fund&#x2019;s share 
price fluctuates, which means you could lose money by investing in the fund.</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_Small-capstocks_S000002121Summary1Member"
      id="ixv-967">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Small-cap 
stocks:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;Investments in securities issued by small-cap companies are likely to be more 
volatile than investments in securities issued by larger companies. Small-cap companies often have less 
experienced management, narrower product lines, more limited financial resources, and less publicly available 
information than larger companies. In addition, small-cap companies are typically more sensitive to changes 
in overall economic conditions and their securities may be difficult to trade.&lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_Valueinvesting_S000002121Summary1Member"
      id="ixv-972">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Value investing:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The fund&#x2019;s value approach to investing could cause it to underperform other stock funds that employ 
a different investment style. The intrinsic value of a stock with value characteristics may not be fully 
recognized by the market for a long time (or at all) or a stock judged to be undervalued may actually 
be appropriately priced at a low level. Value stocks may fail to appreciate for long periods and may 
never reach what the adviser believes are their full market values.&lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_Stockinvesting_S000002121Summary1Member"
      id="ixv-976">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Stock investing:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. 
There is a chance that stock prices overall will decline because stock markets tend to move in cycles, 
with periods of rising and falling prices. The value of stocks held by the fund may decline due to general 
weakness or volatility in the stock markets in which the fund invests or because of factors that affect 
a particular company or industry.&lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_Marketconditions_S000002121Summary1Member"
      id="ixv-980">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Market conditions:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The value of the fund&#x2019;s investments 
may decrease, sometimes rapidly or unexpectedly, due to factors affecting an issuer held by the fund, 
particular industries, or the overall securities markets. A variety of factors can increase the volatility 
of the fund&#x2019;s holdings and markets generally, including economic, political, or regulatory developments, 
recessions, inflation, rapid interest rate changes, war, military conflict, acts of terrorism, natural 
disasters, and outbreaks of infectious illnesses or other widespread public health issues (such as the 
coronavirus pandemic) and related governmental and public responses (including sanctions). Certain events 
may cause instability across global markets, including reduced liquidity and disruptions in trading markets, 
while some events may affect certain geographic regions, countries, sectors, and industries more significantly 
than others. Government intervention in markets may impact interest rates, market volatility, and security 
pricing. These adverse &lt;/span&gt;&lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;developments 
may cause broad declines in market value due to short-term market movements or for significantly longer 
periods during more prolonged market downturns.&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_Sectorexposure_S000002121Summary1Member"
      id="ixv-999">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Sector exposure:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Issuers in the same economic sector may 
be similarly affected by economic or market events, making the fund more vulnerable to unfavorable developments 
in that economic sector than funds that invest more broadly. &lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_Financialservicescompanies_S000002121Summary1Member"
      id="ixv-1003">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Financial services companies:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Because the fund may invest significantly in banks and other financial services companies, the fund 
is more susceptible to adverse developments affecting such companies and may perform poorly during a 
downturn that impacts the financial sector. Banks and other financial services companies can be adversely 
affected by, among other things, regulatory changes, interest rate movements, the availability of capital 
and cost to borrow, and the rate of debt defaults.&lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_REITinvesting_S000002121Summary1Member"
      id="ixv-1007">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;REIT investing:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  REITs must satisfy 
specific requirements for favorable tax treatment and can involve unique risks in addition to the risks 
generally affecting the real estate industry. REITs are dependent upon the quality of their management, 
may have limited financial resources and heavy cash flow dependency, may be highly leveraged, may not 
be diversified geographically or by property type, or may own a limited number of properties.&lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_Foreigninvesting_S000002121Summary1Member"
      id="ixv-1011">&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Foreign 
investing:  &lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;Non-U.S.&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt; &lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;securities tend to be more volatile and have lower overall 
liquidity and trading volume than investments in U.S. securities and may lose value because of adverse 
local, political, social, or economic developments overseas, or due to changes in the exchange rates 
between foreign currencies and the U.S. dollar. Further, securities of non-U.S. issuers are subject to 
trading markets with potential governmental interference, varying regulatory, auditing, and accounting 
standards, and settlement and clearance practices that differ from those of U.S. issuers. Investment 
in non-U.S. securities also carries currency risk. Any attempts to hedge currency risk could be unsuccessful. 
Such investments may have higher transaction costs compared with U.S. markets. The fund&#x2019;s overall foreign 
investing risk is increased to the extent it has exposure to emerging markets.&lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_PrivateplacementsandIPOs_S000002121Summary1Member"
      id="ixv-1017">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Private placements and 
IPOs:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Investments in the stocks of privately held companies and in companies that only recently began to publicly 
trade, such as initial public offerings or IPOs, involve greater risks than investments in stocks of 
companies that have traded publicly on an exchange for extended time periods. There is significantly 
less information available about these companies&#x2019; business models, quality of management, earnings 
growth potential, and other criteria that are normally considered when evaluating the investment prospects 
of a company. Private placements and other restricted securities held by the fund are typically considered 
to be illiquid and tend to be difficult to value since there are no market prices and less overall financial 
information available. The adviser evaluates a variety of factors when assigning a value to these holdings, 
but the determination involves some degree of subjectivity and the value assigned for the fund may differ 
from the value assigned by other mutual funds holding the same security. &lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_Liquidity_S000002121Summary1Member"
      id="ixv-1021">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Liquidity:  &lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;A 
particular investment or an entire market segment may become less liquid or even illiquid, sometimes 
abruptly, which could limit the fund&#x2019;s ability to purchase or sell holdings in a timely manner at a 
desired price. An inability to sell a portfolio holding can adversely affect the &lt;/span&gt;&lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;fund&#x2019;s 
overall value or prevent the fund from being able to take advantage of other investment opportunities. 
Liquidity risk may be magnified during periods of substantial market volatility and unexpected episodes 
of illiquidity may limit the fund&#x2019;s ability to pay redemption proceeds without selling holdings at 
an unfavorable time or at a suitable price. Large redemptions may also have a negative impact on the 
fund&#x2019;s overall liquidity.&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_Activemanagement_S000002121Summary1Member"
      id="ixv-1040">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Active management:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The fund&#x2019;s overall investment program and holdings selected 
by the fund&#x2019;s investment adviser may underperform the broad markets, relevant indices, or other funds 
with similar objectives and investment strategies.&lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:RiskTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_Cybersecuritybreaches_S000002121Summary1Member"
      id="ixv-1044">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;Cybersecurity breaches:&lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The fund could be 
harmed by intentional cyberattacks and other cybersecurity breaches, including unauthorized access to 
the fund&#x2019;s assets, confidential information, or other proprietary information. In addition, a cybersecurity 
breach could cause one of the fund&#x2019;s service providers or financial intermediaries to suffer unauthorized 
data access, data corruption, or loss of operational functionality.&lt;/span&gt;&lt;/p&gt;</rr:RiskTextBlock>
    <rr:BarChartAndPerformanceTableHeading
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143257">Performance</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-1049">&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
following performance information provides some indication of the risks of investing in the fund. The 
fund&#x2019;s performance information represents only past performance (before and after taxes) and is not 
necessarily an indication of future results. &lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The following bar chart illustrates how much returns can differ 
from year to year by showing calendar year returns and the best and worst calendar quarter returns during 
those &lt;/span&gt;&lt;span style="font-size:8.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;years for the fund&#x2019;s Investor Class. Returns for other share classes vary since 
they have different expenses.&lt;/span&gt;&lt;/p&gt;</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143258">The 
following performance information provides some indication of the risks of investing in the fund. The following bar chart illustrates how much returns can differ 
from year to year by showing calendar year returns and the best and worst calendar quarter returns during 
those  years for the fund&#x2019;s Investor Class. Returns for other share classes vary since 
they have different expenses. The following table shows 
the average annual total returns for each class of the fund that has been in operation for at least one 
full calendar year. The fund&#x2019;s performance information included  
 
 in 
the table is compared with a regulatory required index that represents an overall securities market (Regulatory 
Benchmark). In addition, the table may also include one or more indexes that more closely aligns to the 
fund&#x2019;s investment strategy (Strategy Benchmark(s)).</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143259"> The 
fund&#x2019;s performance information represents only past performance (before and after taxes) and is not 
necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:BarChartHeading
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143260">Calendar Year Returns</rr:BarChartHeading>
    <rr:BarChartClosingTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-1066">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:9.02%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.01%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.99%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:13%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:.49%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.99%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.99%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:13%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:5.5%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; font-size:1pt;"&gt;&#160;&lt;/td&gt;&lt;td style="vertical-align:top; font-size:1pt;"&gt;&#160;&lt;/td&gt;&lt;td style="vertical-align:top;"&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:center; font-weight:normal; text-decoration:none;"&gt;Quarter Ended&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top;"&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:center; font-weight:normal; text-decoration:none;"&gt;Total&lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:center; font-weight:normal; text-decoration:none;"&gt;Return&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; font-size:1pt;"&gt;&#160;&lt;/td&gt;&lt;td style="vertical-align:top; font-size:1pt;"&gt;&#160;&lt;/td&gt;&lt;td style="vertical-align:top;"&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:center; font-weight:normal; text-decoration:none;"&gt;Quarter Ended&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top;"&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:center; font-weight:normal; text-decoration:none;"&gt;Total &lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:center; font-weight:normal; text-decoration:none;"&gt;Return&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; font-size:1pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; font-size:1pt;"&gt;&#160;&lt;/td&gt;&lt;td style="vertical-align:top; background-color:#E6E6E6;"&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:center; font-weight:normal; text-decoration:none;"&gt;Best 
Quarter&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; background-color:#E6E6E6;"&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:center; font-weight:normal; text-decoration:none;"&gt;12/31/20&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; background-color:#E6E6E6;"&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:center; font-weight:normal; text-decoration:none;"&gt;28.18%&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; font-size:1pt;"&gt;&#160;&lt;/td&gt;&lt;td style="vertical-align:top; background-color:#E6E6E6;"&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:center; font-weight:normal; text-decoration:none;"&gt;Worst Quarter&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; background-color:#E6E6E6;"&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:center; font-weight:normal; text-decoration:none;"&gt;3/31/20&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; background-color:#E6E6E6;"&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:center; font-weight:normal; text-decoration:none;"&gt;-31.12%&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; font-size:1pt;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
    <rr:HighestQuarterlyReturnLabel
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      id="ixv-143261">Best 
Quarter</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      id="ixv-143262">2020-12-31</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143263"
      unitRef="pure">0.2818</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      id="ixv-143264">Worst Quarter</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      id="ixv-143265">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143266"
      unitRef="pure">-0.3112</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableNarrativeTextBlock
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-1110">&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following table shows 
the average annual total returns for each class of the fund that has been in operation for at least one 
full calendar year. The fund&#x2019;s performance information included &lt;/p&gt;

&lt;p style="-sec-ix-redline:true;font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;in 
the table is compared with a regulatory required index that represents an overall securities market (Regulatory 
Benchmark). In addition, the table may also include one or more indexes that more closely aligns to the 
fund&#x2019;s investment strategy (Strategy Benchmark(s)).&lt;/p&gt;&lt;p style="font-size:8.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;In addition, the table shows hypothetical 
after-tax returns to demonstrate how taxes paid by a shareholder may influence returns. After-tax returns 
are calculated using the historical highest individual federal marginal income tax rates and do not reflect 
the impact of state and local taxes. Actual after-tax returns depend on an investor&#x2019;s tax situation 
and may differ from those shown. After-tax returns shown are not relevant to investors who hold their 
fund shares through tax-deferred arrangements, such as a 401(k) account or an IRA. After-tax returns 
are shown only for the Investor Class and will differ for other share classes.&lt;/p&gt;</rr:PerformanceTableNarrativeTextBlock>
    <rr:PerformanceTableUsesHighestFederalRate
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143269"> After-tax returns 
are calculated using the historical highest individual federal marginal income tax rates and do not reflect 
the impact of state and local taxes.</rr:PerformanceTableUsesHighestFederalRate>
    <rr:PerformanceTableNotRelevantToTaxDeferred
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143270"> Actual after-tax returns depend on an investor&#x2019;s tax situation 
and may differ from those shown. After-tax returns shown are not relevant to investors who hold their 
fund shares through tax-deferred arrangements, such as a 401(k) account or an IRA.</rr:PerformanceTableNotRelevantToTaxDeferred>
    <rr:PerformanceTableOneClassOfAfterTaxShown
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143271">After-tax returns 
are shown only for the Investor Class and will differ for other share classes.</rr:PerformanceTableOneClassOfAfterTaxShown>
    <rr:PerformanceTableHeading
      contextRef="Context_20241231_20241231_S000002121Member_S000002121Summary1Member"
      id="ixv-143272">Average 
Annual Total Returns Periods 
ended December 31, 2024</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnInceptionDate
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      id="ixv-143273">1988-06-30</rr:AverageAnnualReturnInceptionDate>
    <rr:AverageAnnualReturnYear01
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
      id="ixv-143274"
      unitRef="pure">0.1093</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="Context_20241231_20241231_C000005510Member_S000002121Member_S000002121Summary1Member"
      decimals="INF"
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and account minimums, accounts are charged an annual $20 fee.</xhtml:p></link:footnote>
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Inc., has contractually agreed to waive and/or bear all the Z Class&#x2019; expenses (excluding interest; 
expenses related to borrowings, taxes, and brokerage; nonrecurring, extraordinary expenses; and acquired 
fund fees and expenses) in their entirety. T. Rowe Price Associates, Inc., expects this fee waiver and/or 
expense reimbursement arrangement to remain in place indefinitely, and the agreement may only be amended 
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