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Shareholder Report
 12 Months Ended 120 Months Ended
Jul. 31, 2024
USD ($)
Jul. 31, 2024
USD ($)
Shareholder Report [Line Items]    
Document Type N-CSR  
Amendment Flag true  
Amendment Description This amendment was filed to update the dates on the amendment in N-CSR/A and the attestations, also round the cost of the investment in the Tailored Shareholder Reports. The XBRL version was filed with this amendment.  
Registrant Name AMERICAN GROWTH FUND INC  
Entity Central Index Key 0000005138  
Document Period End Date Jul. 31, 2024  
Net Assets $ 20,098,790 $ 20,098,790
Holdings Count 31 31
Advisory Fees Paid, Amount $ 190,890  
Investment Company, Portfolio Turnover 4.00%  
C 000033068 [Member]    
Shareholder Report [Line Items]    
Fund Name American Growth Fund, Inc.  
Class Name Class A  
Trading Symbol AMRAX  
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the American Growth Fund, Inc. - Series One for the period of August 1, 2023 to July 31, 2024.  
Shareholder Report Annual or Semi-Annual Annual Shareholder Report  
Additional Information [Text Block] You can find additional information about the Fund at http://www.americangrowthfund.com/agfs1/agflit_download.htm. You can also request this information by contacting us at 1-800-525-2406.  
Additional Information Phone Number 1-800-525-2406  
Expenses [Text Block] WHAT WERE THE FUND'S COSTS FOR THE PAST YEAR  
Expenses Paid, Amount $ 512  
Expense Ratio, Percent 4.63%  
Factors Affecting Performance [Text Block] HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?  
Performance Past Does Not Indicate Future [Text] Performance quoted for the period ended 7/31/2024 represents past performance and cannot be used to predict future results  
Line Graph [Table Text Block] TOTAL RETURN  
Average Annual Return [Table Text Block] AVERAGE ANNUAL TOTAL RETURN  
No Deduction of Taxes [Text Block] The graph and table do not reflect the reduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.  
Net Assets $ 10,375,182 $ 10,375,182
Advisory Fees Paid, Amount $ 97,691  
Additional Fund Statistics [Text Block]  

KEY FUND STATISTICS
(as of July 31, 2024)

Total Net Assets by Fund   $20,098,790   Total Net Assets by Class   $10,375,182
Total Advisory Fee paid by Fund   $190,890   Total Advisory Fee paid by Class   $97,691
Number of Holdings in the Portfolio   31    
Portfolio Turnover   4%    
C 000033069 [Member]    
Shareholder Report [Line Items]    
Fund Name American Growth Fund, Inc.  
Class Name Class B  
Trading Symbol AMRBX  
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the American Growth Fund, Inc. - Series One for the period of August 1, 2023 to July 31, 2024.  
Shareholder Report Annual or Semi-Annual Annual Shareholder Report  
Additional Information [Text Block] You can find additional information about the Fund at http://www.americangrowthfund.com/agfs1/agflit_download.htm  
Additional Information Phone Number 1-800-525-2406  
Expenses [Text Block] WHAT WERE THE FUND'S COSTS FOR THE PAST YEAR
(based on a hypothetical $10,000 investment) 		 
Expenses Paid, Amount $ 687  
Expense Ratio, Percent 6.27%  
Factors Affecting Performance [Text Block] WHAT FACTORS INFLUENCED PERFORMANCE?  
Performance Past Does Not Indicate Future [Text] Performance quoted for the period ended 7/31/2024 represents past performance and cannot be used to predict future results  
Line Graph [Table Text Block]   TOTAL RETURN
No Deduction of Taxes [Text Block] The graph and table do not reflect the reduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.  
Net Assets $ 261,357 $ 261,357
Advisory Fees Paid, Amount $ 2,517  
Additional Fund Statistics [Text Block] KEY FUND STATISTICS
(as of July 31, 2024) 		 
C 000033067 [Member]    
Shareholder Report [Line Items]    
Fund Name American Growth Fund, Inc.  
Class Name Class D  
Trading Symbol AMRGX  
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the American Growth Fund, Inc. - Series One for the period of August 1, 2023 to July 31, 2024.  
Shareholder Report Annual or Semi-Annual Annual Shareholder Report  
Additional Information [Text Block] You can find additional information about the Fund at http://www.americangrowthfund.com/agfs1/agflit_download.htm. You can also request this information by contacting us at 1-800-525-2406.  
Additional Information Phone Number 1-800-525-2406  
Expenses [Text Block] WHAT WERE THE FUND'S COSTS FOR THE PAST YEAR
(based on a hypothetical $10,000 investment) 		 
Expenses Paid, Amount $ 467  
Expense Ratio, Percent 4.22%  
Performance Past Does Not Indicate Future [Text] Performance quoted for the period ended 7/31/2024 represents past performance and cannot be used to predict future results  
Average Annual Return [Table Text Block] AVERAGE ANNUAL TOTAL RETURN AVERAGE ANNUAL TOTAL RETURN
No Deduction of Taxes [Text Block] The graph and table do not reflect the reduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.  
Net Assets $ 7,947,775 $ 7,947,775
Advisory Fees Paid, Amount $ 76,496  
Investment Company, Portfolio Turnover 4.00%  
Additional Fund Statistics [Text Block] KEY FUND STATISTICS
(as of July 31, 2024) 		 
C 000033070 [Member]    
Shareholder Report [Line Items]    
Fund Name American Growth Fund, Inc.  
Class Name Class C  
Trading Symbol AMRCX  
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the American Growth Fund, Inc. - Series One for the period of August 1, 2023 to July 31, 2024.  
Shareholder Report Annual or Semi-Annual Annual Shareholder Report  
Additional Information [Text Block] You can find additional information about the Fund at http://www.americangrowthfund.com/agfs1/agflit_download.htm. You can also request this information by contacting us at 1-800-525-2406.  
Additional Information Phone Number 1-800-525-2406  
Expenses [Text Block] WHAT WERE THE FUND'S COSTS FOR THE PAST YEAR
(based on a hypothetical $10,000 investment) 		 
Expenses Paid, Amount $ 606  
Expense Ratio, Percent 5.51%  
Performance Past Does Not Indicate Future [Text] Performance quoted for the period ended 7/31/2024 represents past performance and cannot be used to predict future results  
Line Graph [Table Text Block] HOW DID THE FUND PERFORM THE PAST 10 YEARS? TOTAL RETURN
Average Annual Return [Table Text Block]   AVERAGE ANNUAL TOTAL RETURN
No Deduction of Taxes [Text Block] The graph and table do not reflect the reduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.  
Net Assets $ 1,514,476 $ 1,514,476
Advisory Fees Paid, Amount $ 14,186  
Investment Company, Portfolio Turnover 4.00%  
Additional Fund Statistics [Text Block] KEY FUND STATISTICS
(as of July 31, 2024)