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Perritt MicroCap Opportunities Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Perritt MicroCap Opportunities Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Perritt MicroCap Opportunities Fund (the “Fund”) seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund:
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The table below 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.
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)
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 year, the Fund’s portfolio turnover rate was 20.5% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 20.50%
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 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. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption 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 The Fund normally invests at least 80% of its net assets (plus any borrowings for investment purposes) in the common stocks of United States companies with market capitalizations that are below $500 million at the time of initial purchase, which the Fund’s investment adviser refers to as “micro-cap” companies. The Fund invests in both value-priced and aggressive growth stocks. Generally, the Fund’s investment adviser seeks to invest in companies with the following attributes:
•Have demonstrated above-average growth in revenues and/or earnings;
•Possess relatively low levels of long-term debt;
•Have a high percentage of their shares owned by company management; and
•Possess modest price-to-sales ratios and price-to-earnings ratios that are below their long-term annual growth rate.
At times, the Fund may invest in “special situations” such as companies that possess valuable patents, companies undergoing restructuring, and companies involved in large share repurchase programs.
Although the Fund seeks long-term capital appreciation, stocks may be sold in the short-term for several reasons. These include: (1) a company’s market capitalization grows beyond $1.5 billion; (2) a company’s financial condition deteriorates to the point that the Fund’s investment adviser believes that the company’s long-term growth prospects may be impaired; (3) a company receives a purchase offer from another company; or (4) a company’s price-to-sales ratio or price-to-earnings ratio expands to the point that the Fund’s investment adviser believes the company’s stock is significantly overvalued.
The Fund is intended for investors who are willing to withstand the risk of short-term price fluctuations in exchange for potential long-term capital appreciation.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund normally invests at least 80% of its net assets (plus any borrowings for investment purposes) in the common stocks of United States companies with market capitalizations that are below $500 million at the time of initial purchase, which the Fund’s investment adviser refers to as “micro-cap” companies.
Risk [Heading] rr_RiskHeading Principal Risks:
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance:
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance, the Russell 2000® Index, as well as an additional index that reflects the market sector in which the Fund invests, the Russell Microcap® Index. Updated performance information is available on the Fund’s website at www.perrittcap.com or by calling the Fund toll-free at 1-800-332-3133. The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
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 Fund’s performance from year to year and how the Fund’s average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance, the Russell 2000® Index, as well as an additional index that reflects the market sector in which the Fund invests, the Russell Microcap® Index.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex We use the Russell Microcap® Index as an additional index because it compares the Fund’s performance with the return of an index reflecting the performance of investments similar to those of the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-332-3133
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.perrittcap.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 Perritt MicroCap Opportunities Fund Year-by-Year Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the ten year period shown on the bar chart, the Fund’s best and worst quarters are shown below:
Highest Quarterly ReturnLowest Quarterly Return
28.39%(December 31, 2020)-36.96%(March 31, 2020)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarterly Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 28.39%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarterly Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (36.96%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns For the Periods Ended December 31, 2023
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After tax returns are calculated using the historical highest individual stated federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Furthermore, the after-tax returns shown are not relevant to those who hold their shares through tax-deferred arrangements such as 401(k) plans or Individual Retirement Accounts.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
We use the Russell Microcap® Index as an additional index because it compares the Fund’s performance with the return of an index reflecting the performance of investments similar to those of the Fund.
After tax returns are calculated using the historical highest individual stated federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your individual situation and may differ from those shown. In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor. Furthermore, the after-tax returns shown are not relevant to those who hold their shares through tax-deferred arrangements such as 401(k) plans or Individual Retirement Accounts.
Perritt MicroCap Opportunities Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock There is a risk that you could lose all or a portion of your money on your investment in the Fund.
Perritt MicroCap Opportunities Fund | Common Stocks Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Common Stocks: Common stocks occupy the most junior position in a company’s capital structure. Although common stocks have a history of long-term growth in value, their prices fluctuate based on changes in a company’s financial condition and on overall market and economic conditions. Therefore, the price of common stocks may decline for a number of reasons. The price declines may be steep, sudden and/or prolonged. A rise in protectionist trade policies, slowing global economic growth, the risk of trade and geopolitical disputes, and the possibility of changes to some international trade agreements, could affect the economies of many nations, including the United States, in ways that cannot necessarily be foreseen at the present time, and may negatively impact the markets in which the Fund invests.
Perritt MicroCap Opportunities Fund | Sector Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Sector Risk: From time to time, the Fund may concentrate its investments in one or more industry sectors. The Fund is currently substantially invested in the industrials sector, and the Fund’s performance is therefore affected by developments in this sector. The industrials sector consists of companies that may be particularly impacted by government regulation in the U.S. and elsewhere, as well as geopolitical events and economic conditions. In addition, companies in the industrials sector may be particularly impacted by litigation and threatened litigation, labor disputes and foreign exchange rates.
Perritt MicroCap Opportunities Fund | Micro-Cap & Small Capitalization Companies Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Micro-Cap & Small Capitalization Companies: Micro-cap and small capitalization companies typically have relatively lower revenues, limited product lines, lack of management depth, higher risk of insolvency and a smaller share of the market for their products or services than larger capitalization companies. Generally, the share prices of stocks of micro-cap and small capitalization companies are more volatile than those of larger capitalization companies. Thus, the Fund’s share price may increase and decrease by a greater percentage than the share prices of funds that invest in the stocks of large capitalization companies. Also, the returns of micro-cap and small capitalization company stocks may vary, sometimes significantly, from the returns of the overall market. In addition, micro-cap and small capitalization company stocks tend to perform poorly during times of economic stress. Relative to large capitalization company stocks, the stocks of micro-cap and small capitalization companies are thinly traded, and purchases and sales may result in higher transactions costs. For these reasons, the Fund is a suitable investment for only that part of an investor’s capital that can be exposed to above-average risk.
Perritt MicroCap Opportunities Fund | Market Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Market Risk: The Fund may be exposed to “market risk.” Market risk is the risk that stocks may decline significantly in price over short or extended periods of time. Price changes may occur in the market as a whole, or they may occur in only a particular company, industry or sector of the market. In the past decade, financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty.
Perritt MicroCap Opportunities Fund | Manager Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Manager Risk: The Fund may lose money if the Fund’s investment strategy does not achieve the Fund’s objective or the Fund’s investment adviser does not implement the strategy properly.
Perritt MicroCap Opportunities Fund | Liquidity Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Liquidity Risk: Liquidity risk is the risk, due to certain investments trading in lower volumes or to market and economic conditions that the Fund may be unable to find a buyer for its investments when it seeks to sell them or to receive the price it expects based on the Fund’s valuation of the investments. Events that may lead to increased redemptions, such as market disruptions, may also negatively impact the liquidity of the Fund’s investments when it needs to dispose of them. If the Fund is forced to sell its investments at an unfavorable time and/or under adverse conditions in order to meet redemption requests, such sales could negatively affect the Fund. Liquidity issues may also make it difficult to value the Fund’s investments.
Perritt MicroCap Opportunities Fund | Value Investing Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Investing Risk: Value investing risk is the risk associated with the Fund’s investment in companies it considers undervalued relative to their peers or the general stock market where these securities may decline or may not reach what the investment adviser believes are their full value.
Perritt MicroCap Opportunities Fund | Tax Law Change Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Tax Law Change Risk: All statements contained in this Prospectus regarding the U.S. federal income tax consequences of an investment in the Fund are based on current law, which is subject to change at any time, potentially with retroactive effect. For example, tax legislation enacted in 2017 (the Tax Cuts and Jobs Act) resulted in fundamental changes to the Code (some of which are set to expire in the next few years). More recently, the Inflation Reduction Act of 2022 will add a 15% alternative minimum tax on large corporations and a 1% excise tax on repurchases of stock by publicly traded corporations and certain affiliates. The excise tax on repurchases of stock may cause some corporations in which the Fund invests to reduce liquidity opportunities for its investors, which could potentially reduce the value of your investment in the Fund. Such legislation, as well as possible future U.S. tax legislation and administrative guidance, could materially affect the tax consequences of your investment in the Fund and the Fund’s investments or holding structures.
Perritt MicroCap Opportunities Fund | Interest Rate Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Interest Rate Risk: As interest rates rise after a period of historically low interest rates, it may cause potentially sudden and unpredictable effects on the markets and the Fund's investments, and therefore Fund performance may be adversely affected.
Perritt MicroCap Opportunities Fund | Market Disruption And Geopolitical Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Market Disruption and Geopolitical Risk: The Russian military invasion of Ukraine and the resulting actions taken by the United States and European Union in levying broad economic sanctions against Russia could continue to have adverse effects on the price and liquidity of investments, which could adversely affect the financial markets, and therefore, Fund performance. Similarly, the recent conflict between Israel and Hamas in Gaza, and the threat of future hostilities in the broader Middle East region, may have similar adverse effects on the price and liquidity of investments, which could adversely affect the financial markets, and therefore, Fund performance.
Perritt MicroCap Opportunities Fund | Russell Microcap® Index (reflects no deduction for fees expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell Microcap® Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 9.35%
5 Years rr_AverageAnnualReturnYear05 8.56%
10 Years rr_AverageAnnualReturnYear10 5.79%
Perritt MicroCap Opportunities Fund | Russell 2000® Index (reflects no deductions for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell 2000® Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 16.93%
5 Years rr_AverageAnnualReturnYear05 9.97%
10 Years rr_AverageAnnualReturnYear10 7.16%
Perritt MicroCap Opportunities Fund | Investor Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PRCGX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption 2.00%
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 2.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.65%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 168
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 520
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 897
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,955
Annual Return 2013 rr_AnnualReturn2013 46.26%
Annual Return 2014 rr_AnnualReturn2014 0.25%
Annual Return 2015 rr_AnnualReturn2015 (6.09%)
Annual Return 2016 rr_AnnualReturn2016 26.23%
Annual Return 2017 rr_AnnualReturn2017 6.49%
Annual Return 2018 rr_AnnualReturn2018 (17.52%)
Annual Return 2019 rr_AnnualReturn2019 9.36%
Annual Return 2020 rr_AnnualReturn2020 8.88%
Annual Return 2021 rr_AnnualReturn2021 31.33%
Annual Return 2022 rr_AnnualReturn2022 (16.06%)
Annual Return 2023 rr_AnnualReturn2023 12.00%
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 12.00%
5 Years rr_AverageAnnualReturnYear05 8.01%
10 Years rr_AverageAnnualReturnYear10 4.38%
Perritt MicroCap Opportunities Fund | Investor Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 10.04%
5 Years rr_AverageAnnualReturnYear05 6.61%
10 Years rr_AverageAnnualReturnYear10 2.34%
Perritt MicroCap Opportunities Fund | Investor Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 8.33%
5 Years rr_AverageAnnualReturnYear05 6.26%
10 Years rr_AverageAnnualReturnYear10 3.15%
Perritt Ultra MicroCap Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Perritt Ultra MicroCap Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Perritt Ultra MicroCap Fund (the “Fund”) seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund:
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The table below 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.
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)
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 year, the Fund’s portfolio turnover rate was 27.2% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 27.20%
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 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. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption 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 The Fund normally invests at least 80% of its net assets (plus any borrowings for investment purposes) in the common stocks of United States companies with market capitalizations that are below $300 million at the time of initial purchase, which the Fund’s investment adviser refers to as “micro-cap” companies. The micro-cap companies in which the Fund may invest include “early stage” micro-cap companies, which are companies that are in a relatively early stage of development with market capitalizations that are below $50 million.
Micro-cap companies represent the smallest sector of public companies based on market capitalization. Normally, the micro-cap companies in which the Fund invests are in their earliest stages of public development and may offer unique products, services or technologies or may serve special or rapidly expanding niches.
The Fund’s investment adviser uses a “bottom-up” approach of fundamental analysis to look for individual companies that the adviser believes offer significant potential for stock price appreciation. In addition, the adviser seeks to invest in companies with the following attributes:
•Have a high percentage of their shares owned by company management;
•Possess relatively low levels of long-term debt;
•Have a potential for above-average growth in revenues and/or earnings; and
•Possess reasonable valuations based on the ratios of price-to-sales, price-to-earnings, and price-to-book values.
At times, the Fund’s portfolio may contain the shares of unseasoned companies, companies that are undergoing corporate restructuring, initial public offerings, and companies believed to possess undervalued assets.
Although the Fund seeks long-term capital appreciation, stocks may be sold in the short-term for several reasons. These include: (1) a company’s size has expanded beyond the point where it can no longer be considered a small capitalization company; (2) a company’s financial condition deteriorates to the point that, in the opinion of the Fund’s investment adviser, the company’s future growth prospects are impaired; (3) a company’s valuation multiples such as price-to-sales ratio, price-to-earnings ratio, or price-to-book value ratio expand to the point that the Fund’s investment adviser believes the company’s stock is significantly overvalued; or (4) the Fund’s investment adviser believes that another stock has better investment potential.
The Ultra MicroCap Fund is intended for investors who are willing to withstand the risk of short-term price fluctuations in exchange for potential long-term capital appreciation.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund normally invests at least 80% of its net assets (plus any borrowings for investment purposes) in the common stocks of United States companies with market capitalizations that are below $300 million at the time of initial purchase, which the Fund’s investment adviser refers to as “micro-cap” companies.
Risk [Heading] rr_RiskHeading Principal Risks:
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance:
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance, the Russell 2000® Index, as well as an additional index that reflects the market sector in which the Fund invests, the Russell Microcap® Index. Updated performance information is available on the Fund’s website at www.perrittcap.com or by calling the Fund toll-free at 1-800-332-3133. The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
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 Fund’s performance from year to year and how the Fund’s average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance, the Russell 2000® Index, as well as an additional index that reflects the market sector in which the Fund invests, the Russell Microcap® Index.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex We use the Russell Microcap® Index as an additional index because it compares the Fund’s performance with the return of an index reflecting the performance of investments similar to those of the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-332-3133
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.perrittcap.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 Perritt Ultra MicroCap Fund Year-by-Year Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the ten year period shown on the bar chart, the Fund’s best and worst quarters are shown below:
Highest Quarterly ReturnLowest Quarterly Return
30.69 %(March 31, 2021)-29.49 %(March 31, 2020)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarterly Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2021
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 30.69%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarterly Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (29.49%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns for the Periods Ended December 31, 2023
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deductions for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After tax returns are calculated using the historical highest individual stated federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Furthermore, the after-tax returns shown are not relevant to those who hold their shares through tax-deferred arrangements such as 401(k) plans or Individual Retirement Accounts.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
We use the Russell Microcap® Index as an additional index because it compares the Fund’s performance with the return of an index reflecting the performance of investments similar to those of the Fund.
After tax returns are calculated using the historical highest individual stated federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your individual situation and may differ from those shown. In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor. Furthermore, the after-tax returns shown are not relevant to those who hold their shares through tax-deferred arrangements such as 401(k) plans or Individual Retirement Accounts.
Perritt Ultra MicroCap Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock There is a risk that you could lose all or a portion of your money on your investment in the Fund.
Perritt Ultra MicroCap Fund | Common Stocks Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Common Stocks: Common stocks occupy the most junior position in a company’s capital structure. Although common stocks have a history of long-term growth in value, their prices fluctuate based on changes in a company’s financial condition and on overall market and economic conditions. Therefore, the price of common stocks may decline for a number of reasons. The price declines may be steep, sudden and/or prolonged. A rise in protectionist trade policies, slowing global economic growth, the risk of trade and geopolitical disputes, and the possibility of changes to some international trade agreements, could affect the economies of many nations, including the United States, in ways that cannot necessarily be foreseen at the present time, and may negatively impact the markets in which the Fund invests.
Perritt Ultra MicroCap Fund | Sector Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Sector Risk: From time to time, the Fund may concentrate its investments in one or more industry sectors. The Fund is currently substantially invested in the information technology sector, and the Fund’s performance is therefore affected by developments in this sector. Information technology companies may be particularly impacted by rapid changes in technology product cycles, product obsolescence, government regulation, and competition from foreign competitors with lower production costs. Stocks of information technology companies and companies that rely heavily on technology may be more volatile than the overall market.
Perritt Ultra MicroCap Fund | Micro-Cap & Small Capitalization Companies Member  
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Risk [Text Block] rr_RiskTextBlock Micro-Cap & Small Capitalization Companies: Micro-cap and small capitalization companies typically have relatively lower revenues, limited product lines, lack of management depth, higher risk of insolvency and a smaller share of the market for their products or services than larger capitalization companies. Generally, the share prices of stocks of micro-cap and small capitalization companies are more volatile than those of larger capitalization companies. Thus, the Fund’s share price may increase and decrease by a greater percentage than the share prices of funds that invest in the stocks of large capitalization companies. Also, the returns of micro-cap and small capitalization company stocks may
vary, sometimes significantly, from the returns of the overall market. In addition, micro-cap and small capitalization company stocks tend to perform poorly during times of economic stress. Relative to large capitalization company stocks, the stocks of micro-cap and small capitalization companies are thinly traded, and purchases and sales may result in higher transactions costs. For these reasons, the Fund is a suitable investment for only that part of an investor’s capital that can be exposed to above-average risk.
Perritt Ultra MicroCap Fund | Early Stage Companies Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Early Stage Companies: Early stage companies are subject to the same risks as micro-cap companies. In addition, they may not be profitable initially and there is no guarantee that they will become profitable or be able to obtain necessary financing. They may rely on untested business plans. Early stage companies may not be successful in developing markets for their products and services. They may remain an insignificant part of their industry. They may be illiquid or may not be publicly traded. Investments in early stage companies tend to be more volatile and somewhat more speculative than investments in more established companies.
Perritt Ultra MicroCap Fund | Market Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Market Risk: The Fund may be exposed to “market risk.” Market risk is the risk that stocks may decline significantly in price over short or extended periods of time. Price changes may occur in the market as a whole, or they may occur in only a particular company, industry or sector of the market. In the past decade, financial markets throughout the world have experienced increased volatility, depressed valuations, decreased liquidity and heightened uncertainty.
Perritt Ultra MicroCap Fund | Manager Risk Member  
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Risk [Text Block] rr_RiskTextBlock Manager Risk: The Fund may lose money if the Fund’s investment strategy does not achieve the Fund’s objective or the Fund’s investment adviser does not implement the strategy properly.
Perritt Ultra MicroCap Fund | Liquidity Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Liquidity Risk: Liquidity risk is the risk, due to certain investments trading in lower volumes or to market and economic conditions that the Fund may be unable to find a buyer for its investments when it seeks to sell them or to receive the price it expects based on the Fund’s valuation of the investments. Events that may lead to increased redemptions, such as market disruptions, may also negatively impact the liquidity of the Fund’s investments when it needs to dispose of them.  If the Fund is forced to sell its investments at an unfavorable time and/or under adverse conditions in order to meet redemption requests, such sales could negatively affect the Fund. Liquidity issues may also make it difficult to value the Fund’s investments.
Perritt Ultra MicroCap Fund | Value Investing Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Investing Risk: Value investing risk is the risk associated with the Fund’s investment in companies it considers undervalued relative to their peers or the general stock market where these securities may decline or may not reach what the investment adviser believes are their full value.
Perritt Ultra MicroCap Fund | Tax Law Change Risk Member  
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Risk [Text Block] rr_RiskTextBlock Tax Law Change Risk: All statements contained in this Prospectus regarding the U.S. federal income tax consequences of an investment in the Fund are based on current law, which is subject to change at any time, potentially with retroactive effect. For example, tax legislation enacted in 2017 (the Tax Cuts and Jobs Act) resulted in fundamental changes to the Code (some of which are set to expire in the next few years). More recently, the Inflation Reduction Act of 2022 will add a 15% alternative minimum tax on large corporations and a 1% excise tax on repurchases of stock by publicly traded corporations and
certain affiliates. The excise tax on repurchases of stock may cause some corporations in which the Fund invests to reduce liquidity opportunities for its investors, which could potentially reduce the value of your investment in the Fund. Such legislation, as well as possible future U.S. tax legislation and administrative guidance, could materially affect the tax consequences of your investment in the Fund and the Fund’s investments or holding structures.
Perritt Ultra MicroCap Fund | Interest Rate Risk Member  
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Risk [Text Block] rr_RiskTextBlock Interest Rate Risk: As interest rates rise after a period of historically low interest rates, it may cause potentially sudden and unpredictable effects on the markets and the Fund's investments, and therefore Fund performance may be adversely affected.
Perritt Ultra MicroCap Fund | Market Disruption And Geopolitical Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Market Disruption and Geopolitical Risk: The Russian military invasion of Ukraine and the resulting actions taken by the United States and European Union in levying broad economic sanctions against Russia could continue to have adverse effects on the price and liquidity of investments, which could adversely affect the financial markets, and therefore, Fund performance. Similarly, the recent conflict between Israel and Hamas in Gaza, and the threat of future hostilities in the broader Middle East region, may have similar adverse effects on the price and liquidity of investments, which could adversely affect the financial markets, and therefore, Fund performance.
Perritt Ultra MicroCap Fund | Russell Microcap® Index (reflects no deduction for fees expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell Microcap® Index (reflects no deductions for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 9.35%
5 Years rr_AverageAnnualReturnYear05 8.56%
10 Years rr_AverageAnnualReturnYear10 5.79%
Perritt Ultra MicroCap Fund | Russell 2000® Index (reflects no deductions for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell 2000® Index (reflects no deductions for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 16.93%
5 Years rr_AverageAnnualReturnYear05 9.97%
10 Years rr_AverageAnnualReturnYear10 7.16%
Perritt Ultra MicroCap Fund | Investor Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PREOX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption 2.00%
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption 2.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.25%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.79%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.04%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 307
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 939
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,596
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,355
Annual Return 2013 rr_AnnualReturn2013 56.34%
Annual Return 2014 rr_AnnualReturn2014 (4.46%)
Annual Return 2015 rr_AnnualReturn2015 (2.01%)
Annual Return 2016 rr_AnnualReturn2016 19.68%
Annual Return 2017 rr_AnnualReturn2017 17.94%
Annual Return 2018 rr_AnnualReturn2018 (21.24%)
Annual Return 2019 rr_AnnualReturn2019 2.09%
Annual Return 2020 rr_AnnualReturn2020 16.89%
Annual Return 2021 rr_AnnualReturn2021 47.73%
Annual Return 2022 rr_AnnualReturn2022 (25.76%)
Annual Return 2023 rr_AnnualReturn2023 4.99%
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.99%
5 Years rr_AverageAnnualReturnYear05 6.56%
10 Years rr_AverageAnnualReturnYear10 3.64%
Perritt Ultra MicroCap Fund | Investor Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 4.49%
5 Years rr_AverageAnnualReturnYear05 6.07%
10 Years rr_AverageAnnualReturnYear10 2.47%
Perritt Ultra MicroCap Fund | Investor Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 3.25%
5 Years rr_AverageAnnualReturnYear05 5.20%
10 Years rr_AverageAnnualReturnYear10 2.72%