The following tables show historical performance of the Mid Cap Value Fund and provide some indication of the risks of investing in the Fund. Table I shows how the total returns before taxes for the Fund’s Investor Class Shares have varied from year to year for the past 10 years. Table II shows how the Fund’s average annual total returns compare to those of a broad measure of market performance, as well as the Fund’s benchmark index. Past performance (before and after taxes) does not guarantee future results. Updated performance information for the Fund is available on the Fund’s website at heartlandadvisors.com or by calling 1-800-432-7856.

Performance Information Illustrates Variability of Returns [Text]

The following tables show historical performance of the Mid Cap Value Fund and provide some indication of the risks of investing in the Fund.

Bar Chart [Table]

Highest Quarterly Return, Label [Optional Text]

Best Quarter:

Highest Quarterly Return, Date

Dec. 31, 2020

Lowest Quarterly Return

(31.62%)

Performance Table Heading

TABLE II MID CAP VALUE FUND - AVERAGE ANNUAL TOTAL RETURNS [FOR THE PERIODS ENDED 12/31/25]

Performance Table Not Relevant to Tax Deferred

Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred or other tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).

Performance [Table]

	One Year	Five Years	Ten Years	Lifetime (since 10-31-2014)
INVESTOR CLASS SHARES:
Return Before Taxes	0.12%	7.88%	9.55%	7.96%
Return After Taxes on Distributions	-0.39%	5.92%	8.03%	6.56%
Return After Taxes on Distributions and Sale of Fund Shares	0.43%	5.88%	7.47%	6.16%
INSTITUTIONAL CLASS SHARES:
Return Before Taxes	0.38%	8.14%	9.82%	8.23%
Russell 3000^® Index (reflects no deduction for fees, expenses or taxes)	17.15%	13.15%	14.29%	12.95%
Russell Midcap^® Value Index (reflects no deduction for fees, expenses or taxes)	11.05%	9.83%	9.78%	8.45%

Index No Deduction for Fees, Expenses, or Taxes [Text]

(reflects no deduction for fees, expenses or taxes)

Performance Availability Website Address [Text]

heartlandadvisors.com

Bar Chart and Performance Table [Heading]

PAST PERFORMANCE

Performance Past Does Not Indicate Future [Text]

Past performance (before and after taxes) does not guarantee future results.

Bar Chart [Heading]

TABLE I VALUE PLUS FUND - INVESTOR CLASS SHARES - YEAR-BY-YEAR TOTAL RETURNS

Bar Chart Closing [Text Block]

Best Quarter:		Worst Quarter:
4th Quarter of 2020……28.71%		1st Quarter of 2020……-23.48%

Highest Quarterly Return

28.71%

Lowest Quarterly Return, Label [Optional Text]

Worst Quarter:

Lowest Quarterly Return, Date

Mar. 31, 2020

Performance Table Uses Highest Federal Rate

After-tax returns are calculated using the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Explanation after Tax Higher

The differences in before-tax returns and after-tax returns on distributions and sale of Fund shares are due to adjustments incorporated into the after-tax returns for qualified taxable dividend income and qualifying foreign tax credits. The return after taxes on distributions and sale of Fund shares may be higher than other return figures for the same period when a capital loss occurs upon the redemption of Fund shares and provides an assumed tax benefit.

Performance Table One Class of after Tax Shown [Text]

In addition, after-tax returns are shown only for Investor Class Shares, and after-tax returns for the Institutional Class Shares will vary.

Performance Table Closing [Text Block]

After-tax returns are calculated using the highest historical 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’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred or other tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). In addition, after-tax returns are shown only for Investor Class Shares, and after-tax returns for the Institutional Class Shares will vary. The differences in before-tax returns and after-tax returns on distributions and sale of Fund shares are due to adjustments incorporated into the after-tax returns for qualified taxable dividend income and qualifying foreign tax credits. The return after taxes on distributions and sale of Fund shares may be higher than other return figures for the same period when a capital loss occurs upon the redemption of Fund shares and provides an assumed tax benefit.

Performance Availability Phone [Text]

1-800-432-7856

Prospectus [Line Items]

Performance Narrative [Text Block]

The following tables show historical performance of the Value Fund and provide some indication of the risks of investing in the Fund. Table I shows how the total returns before taxes for the Fund’s Investor Class Shares have varied from year to year for the past 10 years. Table II shows how the Fund’s average annual total returns compare to those of a broad measure of market performance, as well as the Fund’s benchmark index. Past performance (before and after taxes) does not guarantee future results. Updated performance information for the Fund is available on the Fund’s website at heartlandadvisors.com or by calling 1-800-432-7856.