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Label Element Value
Entity Central Index Key dei_EntityCentralIndexKey 0000005138
Amendment Flag dei_AmendmentFlag false
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Nov. 29, 2022
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Bar Chart Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 21.79%
Entity Registrant Name dei_EntityRegistrantName AMERICAN GROWTH FUND, INC.
AMERICAN GROWTH FUND Series One | SERIES ONE CLASS D  
10 Years rr_AverageAnnualReturnYear10 13.73%
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 4.00%
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 $ 2,508
1 Year rr_AverageAnnualReturnYear01 1573.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 4,539
5 Years rr_AverageAnnualReturnYear05 14.15%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 954
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 3.00%
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 1,723
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets none
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 4,539
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 $ 954
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 $ 2,508
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 1,723
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
AMERICAN GROWTH FUND Series One | SERIES ONE CLASS A  
10 Years rr_AverageAnnualReturnYear10 13.37%
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 4.36%
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 $ 2,663
1 Year rr_AverageAnnualReturnYear01 15.19%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.30%
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 4,818
5 Years rr_AverageAnnualReturnYear05 13.70%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 987
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 3.06%
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 1,820
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets none
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 4,818
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 $ 987
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 5.00%
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 $ 2,663
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 1,820
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
AMERICAN GROWTH FUND Series One | SERIES ONE CLASS B  
10 Years rr_AverageAnnualReturnYear10 12.79%
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 6.52%
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 $ 3,438
1 Year rr_AverageAnnualReturnYear01 11.43%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 5,514
5 Years rr_AverageAnnualReturnYear05 10.77%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 1,147
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 4.52%
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 2,312
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets none
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 5,514
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 $ 647
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 $ 3,138
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 1,912
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
AMERICAN GROWTH FUND Series One | SERIES ONE CLASS C  
10 Years rr_AverageAnnualReturnYear10 12.82%
10 Years rr_AverageAnnualReturnYear10 16.55%
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 5.40%
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 $ 2,673
1 Year rr_AverageAnnualReturnYear01 13.51%
1 Year rr_AverageAnnualReturnYear01 28.71%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 5,012
5 Years rr_AverageAnnualReturnYear05 12.76%
5 Years rr_AverageAnnualReturnYear05 18.47%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 639
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 3.40%
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 1,610
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
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
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets none
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.
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 5,012
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest quarterly return
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 $ 539
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 $ 2,673
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 1,610
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Bar Chart Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 21.79%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest quarterly return
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (1825.00%)
Year to Date Return, Label rr_YearToDateReturnLabel Year to date performance
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (2917.00%)
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.americangrowthfund.com
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 525-2406