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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName AMERICAN GROWTH FUND INC
Prospectus Date rr_ProspectusDate Nov. 27, 2015
AMERICAN GROWTH FUND Series Two  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Risk Return Summary
Objective [Heading] rr_ObjectiveHeading Investment Objectives/Goals
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund´s primary objective is growth of capital.
Expense [Heading] rr_ExpenseHeading Fee Table
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. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the American Growth Fund. More information about these and other discounts is available from your financial professional and in How to Reduce your Sales Charge, page 8 of the Fund´s prospectus and under Distribution of Fund Shares, Page 14 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) ended July 31, 2014:
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 25% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 25.00%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Purchases of Class E shares in amounts of $1,000,000 or more which are not subject to an initial sales charge generally will be subject to a contingent deferred sales charge of 1.0% of amounts redeemed within the first year of purchase.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the American Growth Fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates "Other Expenses" are based on estimated amounts for the current fiscal year.
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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption You would pay the following expenses if you did not redeem your shares:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategy
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock Investment Research Corporation (the "Adviser") manages the Fund using a growth style of investing. We use a consistent approach to build the Fund´s security portfolio which is made up primarily of common stocks and securities convertible into common stock. These securities are issued by large companies, and to a lesser extent, small and mid-sized companies. When a company´s fundamentals are strong, we believe earnings growth will follow.
Risk [Heading] rr_RiskHeading Principal risks of investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock The primary risks of investing in the Fund are:
  • Stock Market Risk - the value of an investment may fluctuate,
  • Industry and Security Risk - risks relating to an industry as a whole or a company´s prospects for business success,
  • Management Risk - risks that the Adviser´s assessment of a company´s growth prospects may not be accurate,
  • Liquidity Risk - a given security or asset may not be readily marketable,
  • Small Cap Risk - small cap stocks tend to have a high exposure to market fluctuations and failure,
  • Mid Cap Risk - mid cap stocks tend to have a greater exposure to market fluctuations and failure.
  • Convertible Security Risk - risk of loss of principal at maturity.
Loss of some or all of the money you invest is a risk of investing in the Fund.
Risk Lose Money [Text] rr_RiskLoseMoney Loss of some or all of the money you invest is a risk of investing in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Risk/Return Bar Chart and Table
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The bar chart and table are intended to provide you with an indication of the risks of investing in the Fund by showing changes in performance from year to year and by showing how the Fund´s average annual returns for 1 year and since inception (February 23, 2011) of Series Two compared to those of the Standard and Poors 500. Past performance, before and after taxes, is not predictive of future performance. Sales load and account fees are not reflected in the chart. If the sales load and account fees were included, the returns would be less than those that are shown. Updated performance information for the Fund is available at the Fund´s web site (www.americangrowthfund.com) or toll free telephone number (800) 525-2406.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table are intended to provide you with an indication of the risks of investing in the Fund by showing changes in performance from year to year and by showing how the Fund´s average annual returns for 1 year and since inception (February 23, 2011) of Series Two compared to those of the Standard and Poors 500.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 525-2406
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.americangrowthfund.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance, before and after taxes, is not predictive of future performance.
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Sales load and account fees are not reflected in the chart. If the sales load and account fees were included, the returns would be less than those that are shown.
2011 rr_AnnualReturn2011 (15.40%)
2012 rr_AnnualReturn2012 8.87%
2013 rr_AnnualReturn2013 19.76%
2014 rr_AnnualReturn2014 4.26%
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best calendar quarter 12/11 3.68%. Worst calendar quarter 09/11 -24.68%. Year to date performance for the period ended 09/30/2015 was -4.70%.
Year to Date Return, Label rr_YearToDateReturnLabel Year to date performance
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2015
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (4.70%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best calendar quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2011
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.68%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst calendar quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.68%)
Performance Table Heading rr_PerformanceTableHeading For the periods ended December 31, 2014
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 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, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts;
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for only Class D and after-tax returns for other Classes will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock 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´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 arrangements, such as 401(k) plans or individual retirement accounts;
After-tax returns are shown for only Class D and after-tax returns for other Classes will vary.
AMERICAN GROWTH FUND Series Two | Class E  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum deferred sales charge (load) as a percentage of original purchase price or redemption proceeds, whichever is lower rr_MaximumDeferredSalesChargeOverOther 1.00% [1]
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fees rr_RedemptionFeeOverRedemption none
Exchange Fee rr_ExchangeFeeOverRedemption none
Maximum Account Fee rr_MaximumAccountFeeOverAssets none
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.30%
Other Expenses rr_OtherExpensesOverAssets 5.57% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 6.87%
1 Year rr_ExpenseExampleYear01 $ 1,316
3 Years rr_ExpenseExampleYear03 2,464
1 Year rr_ExpenseExampleNoRedemptionYear01 1,216
3 Years rr_ExpenseExampleNoRedemptionYear03 $ 2,464
One Year rr_AverageAnnualReturnYear01 4.26%
Since Inception rr_AverageAnnualReturnSinceInception 3.69%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 23, 2011
AMERICAN GROWTH FUND Series Two | Class F  
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 original purchase price or redemption proceeds, whichever is lower rr_MaximumDeferredSalesChargeOverOther 1.00% [3]
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fees rr_RedemptionFeeOverRedemption none
Exchange Fee rr_ExchangeFeeOverRedemption none
Maximum Account Fee rr_MaximumAccountFeeOverAssets none
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 5.57% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 7.57%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock For one year.
1 Year rr_ExpenseExampleYear01 $ 847
3 Years rr_ExpenseExampleYear03 2,185
1 Year rr_ExpenseExampleNoRedemptionYear01 747
3 Years rr_ExpenseExampleNoRedemptionYear03 $ 2,185
One Year rr_AverageAnnualReturnYear01 3.61%
Since Inception rr_AverageAnnualReturnSinceInception 3.01%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 23, 2011
AMERICAN GROWTH FUND Series Two | Return after taxes on Distributions | Class E  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 3.61%
Since Inception rr_AverageAnnualReturnSinceInception 3.01%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 23, 2011
AMERICAN GROWTH FUND Series Two | Return after taxes on Distributions and Sale of Fund Shares | Class F  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 3.61%
Since Inception rr_AverageAnnualReturnSinceInception 3.01%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 23, 2011
AMERICAN GROWTH FUND Series Two | Standard and Poors 500 (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 13.69%
Since Inception rr_AverageAnnualReturnSinceInception 10.48%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 23, 2011
[1] Purchases of Class E shares in amounts of $1,000,000 or more which are not subject to an initial sales charge generally will be subject to a contingent deferred sales charge of 1.0% of amounts redeemed within the first year of purchase.
[2] "Other Expenses" are based on estimated amounts for the current fiscal year.
[3] For one year.