v3.24.3
Label Element Value
Integrity Short Term Government Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading INTEGRITY SHORT TERM GOVERNMENT FUND—FUND SUMMARY
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Integrity Short Term Government Fund (the “Fund”) seeks to achieve a high and stable rate of total return, when and as opportunities are available in the context of preserving capital in adverse markets.

Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts with respect to purchases of Class A shares of the Fund if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund or in other funds in the Integrity/Viking family of funds. More information about these and other discounts is available from your financial professional and in “The Shares Offered; Class A Shares” and “How to Reduce Your Sales Charge” on page 43 and 46, respectively, of the Fund’s prospectus, Appendix A of the Fund’s prospectus, and “Purchase and Redemption of Shares” on page B-51 of the Fund’s statement of additional information.

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Nov. 29, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover—
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund 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’s performance. During the most recent fiscal period, the Fund’s portfolio turnover rate was 57.27% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 57.27%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts with respect to purchases of Class A shares of the Fund if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund or in other funds in the Integrity/Viking family of funds. More information about these and other discounts is available from your financial professional and in “The Shares Offered; Class A Shares” and “How to Reduce Your Sales Charge” on page 43 and 46, respectively, of the Fund’s prospectus, Appendix A of the Fund’s prospectus, and “Purchase and Redemption of Shares” on page B-51 of the Fund’s statement of additional information.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example—
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the costs of investing in other mutual funds. The Example assumes you invest $10,000 in the Fund for the time periods indicated and then either redeem or do not redeem your shares at those periods. The Example also assumes that your investment has a 5% return each year, that the Fund’s operating expenses remain the same, and that the contractual expense limitation agreement remains in place for the first year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

To achieve its investment objective, the Fund invests at least 95% of its assets in U.S. Government and agency mortgage-backed securities (“MBS”) and other securities issued or guaranteed by the U.S. Government, its agencies or instrumentalities (including Ginnie Mae, Fannie Mae and Freddie Mac, as defined below), and collateralized mortgage obligations (“CMOs”), backed by U.S. Government and agency MBS. Some of the Fund’s investments may be backed by the full faith and credit of the U.S. Government, while others may be supported only by the discretionary authority of the U.S. Government or only by the credit of the issuing agency or instrumentality.

 

Under normal market conditions, the target dollar-weighted average effective duration for the Fund is expected to range between one and three years. Duration is a measure of a fixed income security’s price sensitivity to changes in interest rates. Duration takes into account a security’s cash flows over time, including the possibility that a security might be prepaid by the issuer or redeemed by the holder prior to its stated maturity date. In contrast, maturity measures only the time until final payment is due. The duration of the Fund’s portfolio is expressed in years and measures the portfolio’s change in value for changes in interest rates. The Fund may also invest in U.S. Treasury bills. The securities held by the Fund may be fixed or variable rate obligations. The Fund may also purchase securities on a when-issued or delayed-delivery basis.

 

To construct the Fund’s investment portfolio, the Fund’s investment sub-adviser, M.D. Sass, LLC (“M.D. Sass” or “Sub-Adviser”), utilizes a process based on rigorous quantitative tests. These tests include projecting underlying mortgage prepayment rates under a variety of interest rate scenarios and demographic trends, with regard to any given security’s sensitivity to cash flow risk. The nature of such testing is to measure homeowner refinancing/prepayment behavior, relative to mortgage rate changes, and other factors influencing such behavior. The Sub-Adviser’s process is primarily structured to create value through intensive (i.e. bottom-up) security selection, portfolio construction and relative value trading. Top-down macro issues and factors are incorporated into the process when considered by the Sub-Adviser to be appropriate.

 

The Sub-Adviser may sell a security if its value becomes unattractive, such as when its fundamentals deteriorate, or when other investment opportunities exist that may have more attractive yields. The Fund may engage in frequent and active trading of securities as a part of its principal investment strategy.

Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal market conditions, the target dollar-weighted average effective duration for the Fund is expected to range between one and three years.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Fund Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

As a result of the reorganization of the M.D. Sass Short Term U.S. Government Agency Income Fund (the “Predecessor Fund”) into Class I of the Fund on January 17, 2020 (the “Reorganization”), the performance and accounting history of the Predecessor Fund was assumed by Class I shares of the Fund. The performance information of Class I shares prior to completion of the Reorganization is that of the Predecessor Fund’s Institutional Class shares.

 

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the performance of the Fund’s Class I shares from calendar year to calendar year and by showing how the average annual total returns for 1, 5, and 10 years for Class I shares, and for 1 year and since inception for Class A shares, and how they compare with those of a broad measure of market performance.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the performance of the Fund’s Class I shares from calendar year to calendar year and by showing how the average annual total returns for 1, 5, and 10 years for Class I shares, and for 1 year and since inception for Class A shares, and how they compare with those of a broad measure of market performance.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess U.S. Government having a maturity of at least one year and less than three years.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-276-1262
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.integrityvikingfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Per Share Total Return per Calendar Year
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

During the periods shown in the bar chart, the highest return for a quarter was 3.31% (quarter ended December 31, 2023) and the lowest return for a quarter was -3.62% (quarter ended September 30, 2022). The year-to-date return of the Fund’s Class I shares through September 30, 2024 is 7.40%.

Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the periods ended December 31, 2023)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of any state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown here, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class I shares only; after-tax returns for Class A shares will vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of any state and local taxes. After-tax returns are shown for Class I shares only; after-tax returns for Class A shares will vary. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown here, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).

 

The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available at www.integrityvikingfunds.com or by calling 800-276-1262.

Integrity Short Term Government Fund | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock As with all mutual funds, there is the risk that you could lose money through your investment in the Fund. Many factors affect the Fund’s net asset value and performance.
Integrity Short Term Government Fund | Risk Not Insured Depository Institution [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Integrity Short Term Government Fund | Risks of U.S. Government Securities [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Risks of U.S. Government Securities: Securities issued by U.S. Government agencies and instrumentalities have different levels of U.S. Government credit support. Some are backed by the full faith and credit of the U.S. Government, while others are supported by only the discretionary authority of the U.S. Government or only by the credit of the agency or instrumentality. No assurance can be given that the U.S. Government will provide financial support to U.S. Government-sponsored instrumentalities because they are not obligated to do so by law. Guarantees of timely prepayment of principal and interest do not assure that the market prices and yields of the securities are guaranteed nor do they guarantee the net asset value or performance of the Fund, which will vary with changes in interest rates and other market conditions.
Integrity Short Term Government Fund | Mortgage-Backed Securities Risks [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Mortgage-Backed Securities Risks:Prepayment Risk of Mortgage-Backed Securities. In times of declining interest rates, the Fund’s higher yielding securities are more likely to be prepaid and the Fund will have to replace them with securities having a lower yield.Extension Risk of Mortgage-Backed Securities. In times of rising interest rates, mortgage prepayments will slow causing portfolio securities considered short or intermediate term to be long-term securities which fluctuate more widely in response to changes in interest rates than shorter term securities.
Integrity Short Term Government Fund | Credit Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Credit Risk: Credit risk is the risk that the credit strength of an issuer will weaken and/or an issuer of a security will fail to pay principal and interest in a timely manner, reducing the Fund’s total return. Changes in an issuer’s financial strength or in a security’s credit rating may affect its value.
Integrity Short Term Government Fund | Interest Rate Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Interest Rate Risk: Interest rate risk is the risk that debt securities will decline in value because of changes in interest rates. As nominal interest rates rise, the value of certain debt securities held by the Fund is likely to decrease. Debt securities with longer durations tend to be more sensitive to changes in interest rates, usually making them more volatile than securities with shorter durations.
Integrity Short Term Government Fund | Income Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Income Risk: Income risk is the risk that the income from the Fund’s portfolio will decline because of falling market interest rates. This can result when the Fund invests the proceeds from new share sales, or from matured or called bonds, at market interest rates that are below the portfolio’s current earnings rate.
Integrity Short Term Government Fund | Variable Rate Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Variable Rate Securities Risk: Variable rate securities pay interest at rates that reset periodically (typically, daily, monthly, quarterly, or semi-annually) in response to changes in the market rate of interest on which the interest rate is based. Variable rate securities generally are less price sensitive to interest rate changes than fixed rate debt securities. When interest rates fall, there may be a reduction in the payments of interest received by the Fund from its variable rate securities.
Integrity Short Term Government Fund | When-Issued Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock When-Issued Securities Risk: There is a risk that the price or yield obtained in a when-issued transaction may be less favorable than the price or yield available in the market when the security is delivered, or that failure of a party to a transaction to consummate the trade may result in a loss to the Fund or missed opportunity to obtain a price considered advantageous.
Integrity Short Term Government Fund | Liquidity Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Liquidity Risk: Certain securities in which the Fund invests may be less readily marketable and may be subject to greater fluctuation in price than other securities. These features may make it more difficult to sell or buy a security at a favorable price or time.
Integrity Short Term Government Fund | General Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock General Market Risk: There is no assurance that the Fund will meet its investment objective. The prices of the securities in which the Fund invests may fluctuate and the Fund’s share price and the value of your investment may change. Since the value of the Fund’s shares can go up or down, it is possible to lose money by investing in the Fund.
Integrity Short Term Government Fund | Management Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Management Risk: The ability of the Fund to meet its investment objective is directly related to the effectiveness of the sub-adviser’s research, analysis and asset allocation among portfolio securities. If the sub-adviser’s investment strategies do not produce the expected results, the value of your investment could be diminished or even lost entirely.
Integrity Short Term Government Fund | Valuation Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Valuation Risk: The sales price the Fund could receive for any particular portfolio investment may differ from the Fund’s valuation of the investment, particularly for securities that trade in thin or volatile markets or that are valued using a fair value methodology.
Integrity Short Term Government Fund | Cybersecurity Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Cybersecurity Risk: Cybersecurity breaches may allow an unauthorized party to gain access to Fund assets, customer data, or proprietary information, or cause the Fund and/or its service providers to suffer data corruption or lose operational functionality. The Fund’s share price may decline as a result of unauthorized actions taken during a security breach or subsequent market activity in response to the security breach.
Integrity Short Term Government Fund | Bloomberg U.S. Aggregate Bond Index(1) (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes reflects no deduction for fees, expenses, or taxes
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index(1) (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53% [1]
5 Years rr_AverageAnnualReturnYear05 5.64% [1]
10 Years rr_AverageAnnualReturnYear10 1.81% [1]
Since Inception rr_AverageAnnualReturnSinceInception (0.85%) [1]
Integrity Short Term Government Fund | ICE BofA 1-3 Year U.S. Treasury Index(2) (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes reflects no deduction for fees, expenses, or taxes
Label rr_AverageAnnualReturnLabel ICE BofA 1-3 Year U.S. Treasury Index(2) (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 4.26% [2]
5 Years rr_AverageAnnualReturnYear05 1.30% [2]
10 Years rr_AverageAnnualReturnYear10 1.05% [2]
Since Inception rr_AverageAnnualReturnSinceInception 0.73% [2]
Integrity Short Term Government Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.00%
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFee none
Exchange Fee rr_ExchangeFee none
Management Fees rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.64%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.19% [3]
Fee Waivers and Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.39%) [4]
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements rr_NetExpensesOverAssets 0.80% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 280
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 532
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 804
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,580
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 2.03%
5 Years rr_AverageAnnualReturnYear05
10 Years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception (1.05%)
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 17, 2020
Integrity Short Term Government Fund | Class A | Bloomberg U.S. Aggregate Bond Index(1) (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 17, 2020
Integrity Short Term Government Fund | Class A | ICE BofA 1-3 Year U.S. Treasury Index(2) (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 17, 2020
Integrity Short Term Government Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFee none
Exchange Fee rr_ExchangeFee none
Management Fees rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.64%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.94% [3]
Fee Waivers and Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.39%) [4]
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements rr_NetExpensesOverAssets 0.55% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 56
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 261
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 482
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,119
Annual Return 2014 rr_AnnualReturn2014 1.41%
Annual Return 2015 rr_AnnualReturn2015 (0.03%)
Annual Return 2016 rr_AnnualReturn2016 0.59%
Annual Return 2017 rr_AnnualReturn2017 1.19%
Annual Return 2018 rr_AnnualReturn2018 2.19%
Annual Return 2019 rr_AnnualReturn2019 3.54%
Annual Return 2020 rr_AnnualReturn2020 2.75%
Annual Return 2021 rr_AnnualReturn2021 (1.12%)
Annual Return 2022 rr_AnnualReturn2022 (6.92%)
Annual Return 2023 rr_AnnualReturn2023 4.47%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2024
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 7.40%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.31%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.62%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.47%
5 Years rr_AverageAnnualReturnYear05 0.50%
10 Years rr_AverageAnnualReturnYear10 0.79%
Since Inception rr_AverageAnnualReturnSinceInception
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2011
Integrity Short Term Government Fund | Class I | Return After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 4.47%
5 Years rr_AverageAnnualReturnYear05 (0.41%)
10 Years rr_AverageAnnualReturnYear10 (0.24%)
Since Inception rr_AverageAnnualReturnSinceInception
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2011
Integrity Short Term Government Fund | Class I | Return After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 3.35%
5 Years rr_AverageAnnualReturnYear05 0.09%
10 Years rr_AverageAnnualReturnYear10 0.20%
Since Inception rr_AverageAnnualReturnSinceInception
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2011
[1] The Fund changed its primary index to the Bloomberg U.S. Aggregate Bond Index, a broad based, market capitalization-weighted bond market index representing intermediate term investment grade bonds.
[2] The ICE BofA 1-3 Year U.S. Treasury Index is an unmanaged index that tracks the performance of the direct sovereign debt of the U.S. Government having a maturity of at least one year and less than three years. It is not possible to invest directly in an unmanaged index.
[3] Acquired Fund Fees and Expenses are expenses indirectly incurred by the Fund through its investments in one or more underlying funds, including money market funds. Because these costs are indirect, the Total Annual Fund Operating Expenses do not correlate to the ratios of expenses to average net assets in the Fund’s most recent annual Form N-CSR.
[4] The Fund’s investment adviser, Viking Fund Management, LLC (“Viking Management,” “investment manager,” or the “Adviser”), has contractually agreed to waive fees and reimburse expenses through November 29, 2025, so that Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements (excluding taxes, brokerage fees, commissions, extraordinary and non-recurring expenses, and acquired fund fees and expenses) do not exceed 0.80% of average daily net assets for Class A shares and 0.55% of average daily net assets for Class I shares. This expense limitation agreement may only be terminated or modified prior to November 29, 2025, with the approval of the Fund’s Board of Trustees. Viking Management may recoup such amounts waived or reimbursed for a period of up to three years from the date of the reimbursement or waiver. The Fund will make repayments to the Adviser only if such repayment does not cause the annual Fund operating expenses (after the repayment is taken into account) to exceed both (1) the expense limitation in place when such amounts were waived or reimbursed and (2) the Fund’s current expense limitation. Any similar amounts waived or reimbursed under an agreement for the benefit of the Predecessor Fund prior to the date of the Reorganization are not eligible for repayment.