Label	Element	Value
Entity Registrant Name	dei_EntityRegistrantName	AMERICAN GROWTH FUND, INC.
Document Type	dei_DocumentType	485BPOS
Entity Central Index Key	dei_EntityCentralIndexKey	0000005138
Entity Inv Company Type	dei_EntityInvCompanyType	N-1A
Amendment Flag	dei_AmendmentFlag	false
S 000012125 [Member] \| C 000033069 [Member]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Management Fees (as a percentage of Assets)	rr_ManagementFeesOverAssets	1.00%
5 Years	rr_AverageAnnualReturnYear05	6.62%
10 Years	rr_AverageAnnualReturnYear10	7.89%
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	$ 3,668
Redemption Fee (as a percentage of Amount Redeemed)	rr_RedemptionFeeOverRedemption	none
Maximum Deferred Sales Charge (as a percentage of Offering Price)	rr_MaximumDeferredSalesChargeOverOfferingPrice	5.00%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	none
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	$ 3,368
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	6,042
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	6,042
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 1,203
1 Year	rr_AverageAnnualReturnYear01	(22.39%)
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	$ 703
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	2,064
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	$ 2,464
Expenses (as a percentage of Assets)	rr_ExpensesOverAssets	7.10%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Other Expenses (as a percentage of Assets):	rr_OtherExpensesOverAssets	5.10%
S 000012125 [Member] \| C 000033070 [Member]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Management Fees (as a percentage of Assets)	rr_ManagementFeesOverAssets	1.00%
5 Years	rr_AverageAnnualReturnYear05	8.88%
10 Years	rr_AverageAnnualReturnYear10	8.32%
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	$ 3,102
Redemption Fee (as a percentage of Amount Redeemed)	rr_RedemptionFeeOverRedemption	none
Maximum Deferred Sales Charge (as a percentage of Offering Price)	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	none
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	$ 3,102
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	5,775
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 5,775
Exchange Fee (as a percentage of Amount Redeemed)	rr_ExchangeFeeOverRedemption	none
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 738
1 Year	rr_AverageAnnualReturnYear01	(21.61%)
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	$ 638
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	1,888
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	$ 1,888
Expenses (as a percentage of Assets)	rr_ExpensesOverAssets	6.43%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Other Expenses (as a percentage of Assets):	rr_OtherExpensesOverAssets	4.43%
S 000012125 [Member] \| C 000033067 [Member]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Management Fees (as a percentage of Assets)	rr_ManagementFeesOverAssets	1.00%
5 Years	rr_AverageAnnualReturnYear05	10.14%
10 Years	rr_AverageAnnualReturnYear10	11.26%
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	$ 2,985
Redemption Fee (as a percentage of Amount Redeemed)	rr_RedemptionFeeOverRedemption	none
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	none
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	$ 2,985
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	5,379
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 5,379
Exchange Fee (as a percentage of Amount Redeemed)	rr_ExchangeFeeOverRedemption	none
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 1,058
1 Year	rr_AverageAnnualReturnYear01	(20.51%)
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	$ 1,058
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	2,023
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	$ 2,023
Expenses (as a percentage of Assets)	rr_ExpensesOverAssets	5.13%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Other Expenses (as a percentage of Assets):	rr_OtherExpensesOverAssets	4.13%
S 000012125 [Member] \| C 000033068 [Member]
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Management Fees (as a percentage of Assets)	rr_ManagementFeesOverAssets	1.00%
5 Years	rr_AverageAnnualReturnYear05	9.76%
5 Years	rr_AverageAnnualReturnYear05	13.34%
10 Years	rr_AverageAnnualReturnYear10	10.88%
10 Years	rr_AverageAnnualReturnYear10	14.63%
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	$ 3,155
Redemption Fee (as a percentage of Amount Redeemed)	rr_RedemptionFeeOverRedemption	none
Maximum Deferred Sales Charge (as a percentage of Offering Price)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.30%
Distribution and Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	none
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	$ 3,155
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	5,664
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 5,664
Exchange Fee (as a percentage of Amount Redeemed)	rr_ExchangeFeeOverRedemption	none
Exchange Fee (as a percentage of Amount Redeemed)	rr_ExchangeFeeOverRedemption	none
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 1,097
1 Year	rr_AverageAnnualReturnYear01	(20.72%)
1 Year	rr_AverageAnnualReturnYear01	(18.03%)
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	$ 1,097
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	2,131
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	$ 2,131
Expenses (as a percentage of Assets)	rr_ExpensesOverAssets	5.55%
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Other Expenses (as a percentage of Assets):	rr_OtherExpensesOverAssets	4.25%

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The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

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A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

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One of: N-1A (Mutual Fund), N-1 (Open-End Separate Account with No Variable Annuities), N-2 (Closed-End Investment Company), N-3 (Separate Account Registered as Open-End Management Investment Company), N-4 (Variable Annuity UIT Separate Account), N-5 (Small Business Investment Company), N-6 (Variable Life UIT Separate Account), S-1 or S-3 (Face Amount Certificate Company), S-6 (UIT, Non-Insurance Product).

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Total Annual Fund Operating Expenses.

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Exchange Fee includes the maximum fee charged for any exchange or transfer of interest from the Fund to another fund. The Fund may include in a footnote to the table, if applicable, a tabular presentation of the range of exchange fees or a narrative explanation of the fees.

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The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.

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Total Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."

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Management Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."

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Maximum Deferred Sales Charge (Load) (as a percentage of ____) A.3.instructions.2.a.i "Maximum Deferred Sales Charge (Load)" includes the maximum total deferred sales charge (load) payable upon redemption, in installments, or both, expressed as a percentage of the amount or amounts stated in response to Item 7(a), except that, for a sales charge (load) based on net asset value at the time of purchase, show the sales charge (load) as a percentage of the offering price at the time of purchase. A Fund may include in a footnote to the table, if applicable, a tabular presentation showing the amount of deferred sales charges (loads) over time or a narrative explanation of the sales charges (loads) (e.g., __% in the first year after purchase, declining to __% in the __ year and eliminated thereafter). A.3.instructions.2.a.ii If more than one type of sales charge (load) is imposed (e.g., a deferred sales charge (load) and a front-end sales charge (load)), the first caption in the table should read "Maximum Sales Charge (Load)" and show the maximum cumulative percentage. Show the percentage amounts and the terms of each sales charge (load) comprising that figure on separate lines below.

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"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.

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"Redemption Fee" (as a percentage of amount redeemed, if applicable) If the Fund is an Exchange-Traded Fund and issues or redeems shares in creation units of not less than 25,000 shares each, exclude any fees charged for the purchase and redemption of the Fund's creation units. "Redemption Fee" includes a fee charged for any redemption of the Fund's shares, but does not include a deferred sales charge (load) imposed upon redemption.

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