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Jacob Small Cap Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] ck0001090372_SupplementTextBlock
Jacob Funds Inc.

Supplement dated August 24, 2016 to the Prospectus dated January 4, 2016.

JACOB SMALL CAP GROWTH FUND

Effective September 1, 2016, the information in the Prospectus for the Jacob Small Cap Growth Fund under the heading "Fees and Expenses" is replaced with the following:
Risk/Return [Heading] rr_RiskReturnHeading Jacob Small Cap Growth Fund
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.
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 paid each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Jan. 02, 2017
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent The Distribution and/or Service (12b-1) Fees reflect the Board's determination to reduce such fees payable under the distribution and service plan of the Fund, with respect to Investor Class shares, from 0.35% to 0.25%, effective September 1, 2016 through at least January 2, 2018. Annual Fund Operating Expenses have been restated to reflect such 12b-1 fee reduction.
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 over 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. The Example reflects adjustments made to the Fund's operating expenses due to the fee waiver by the Adviser for the 1 Year example and for the first year of the 3, 5, and 10 Year examples only.
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:
Jacob Small Cap Growth Fund | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Advisory Fees rr_ManagementFeesOverAssets 0.90%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25% [1]
Other Expenses rr_OtherExpensesOverAssets 1.23%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.38%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.13%) [2]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 2.25%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 228
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 751
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,300
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,799
Jacob Small Cap Growth Fund | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Advisory Fees rr_ManagementFeesOverAssets 0.90%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none [1]
Other Expenses rr_OtherExpensesOverAssets 1.27%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.17%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.22%) [2]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 1.95%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 198
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 658
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,144
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,486
[1] The Distribution and/or Service (12b-1) Fees reflect the Board's determination to reduce such fees payable under the distribution and service plan of the Fund, with respect to Investor Class shares, from 0.35% to 0.25%, effective September 1, 2016 through at least January 2, 2018. Annual Fund Operating Expenses have been restated to reflect such 12b-1 fee reduction.
[2] The Adviser has contractually agreed, through at least January 2, 2017, to waive up to 100% of its advisory fees to the extent that the Total Annual Fund Operating Expenses (excluding any taxes, interest, brokerage fees, acquired fund fees and expenses, and extraordinary expenses) exceed 2.25% or 1.95% for Investor Class shares and Institutional Class shares, respectively, of each class' average daily net assets. Pursuant to this fee waiver agreement, the Adviser is entitled to recoup any fees that it waived for a period of three years following such fee waivers to the extent that such recoupment will not cause the Fund to exceed any applicable expense limitation that was in place for the Fund when the fees were waived. Please note that the maximum waiver is 0.90%, which means that the Fund's overall expenses could exceed 2.25% for Investor Class shares or 1.95% for Institutional Class shares. This waiver agreement may only be terminated by the Board.