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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Apr. 12, 2011
Registrant Name dei_EntityRegistrantName AMERICAN GROWTH FUND INC
Central Index Key dei_EntityCentralIndexKey 0000005138
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Apr. 12, 2011
Document Effective Date dei_DocumentEffectiveDate Apr. 13, 2011
Prospectus Date rr_ProspectusDate Feb. 23, 2011
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.
Fee Table agfi5138_FundFeesAndExpensesAbstract  
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 11 of the Fund´s prospectus and under Distribution of Fund Shares, Page 14 of the Fund´s statement of additional information.
Expense Breakpoint Discounts agfi5138_ExpenseBreakpointDiscountsAbstract  
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
SHAREHOLDER FEES: rr_ShareholderFeesAbstract  
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption SHAREHOLDER FEES: (fees paid directly from your investment)
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
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):
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates "Other Expenses" are based on estimated amounts for the current fiscal year.
Expense Example: rr_ExpenseExampleAbstract  
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: rr_ExpenseExampleNoRedemptionAbstract  
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption You would pay the following expenses if you did not redeem your shares:
Portfolio Turnover agfi5138_PortfolioTurnoverAltAbstract  
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.
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.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration 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.
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 stock risk tend to have a high exposure to market fluctuations and failure,

Mid Cap Risk - mid cap stock risk 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.
American Growth Fund Series Two | CLASS E
  
SHAREHOLDER FEES: rr_ShareholderFeesAbstract  
Shareholder Fees Column [Text] rr_ShareholderFeesColumnName Class E
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_MaximumDeferredSalesChargeOverOfferingPrice 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
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Operating Expenses Column [Text] rr_OperatingExpensesColumnName Class E
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.30%
Other Expenses rr_OtherExpensesOverAssets 3.51% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 4.81%
Expense Example: rr_ExpenseExampleAbstract  
Expense Example, By Year, Column [Text] rr_ExpenseExampleByYearColumnName Class E
1 Year rr_ExpenseExampleYear01 1,031
3 Years rr_ExpenseExampleYear03 1,947
Expense Example, No Redemption: rr_ExpenseExampleNoRedemptionAbstract  
Expense Example, No Redemption, By Year, Column [Text] rr_ExpenseExampleNoRedemptionByYearColumnName Class E
1 Year rr_ExpenseExampleNoRedemptionYear01 1,031
3 Years rr_ExpenseExampleNoRedemptionYear03 1,947
American Growth Fund Series Two | CLASS F
  
SHAREHOLDER FEES: rr_ShareholderFeesAbstract  
Shareholder Fees Column [Text] rr_ShareholderFeesColumnName Class F
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_MaximumDeferredSalesChargeOverOfferingPrice 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
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Operating Expenses Column [Text] rr_OperatingExpensesColumnName Class F
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 3.51% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 5.51%
Expense Example: rr_ExpenseExampleAbstract  
Expense Example, By Year, Column [Text] rr_ExpenseExampleByYearColumnName Class F
1 Year rr_ExpenseExampleYear01 653
3 Years rr_ExpenseExampleYear03 1,649
Expense Example, No Redemption: rr_ExpenseExampleNoRedemptionAbstract  
Expense Example, No Redemption, By Year, Column [Text] rr_ExpenseExampleNoRedemptionByYearColumnName Class F
1 Year rr_ExpenseExampleNoRedemptionYear01 553
3 Years rr_ExpenseExampleNoRedemptionYear03 1,649
[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.