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EQUITY METHOD INVESTMENT - Equity investee's summarized financial data (Details) - USD ($) | 3 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
EQUITY METHOD INVESTMENT |  |
Total external revenue | $ 422,571,278 | $ 404,744,774
Gross profit | 26,932,663 | 23,461,979
Net income before income taxes | 3,475,690 | 3,753,271
Net income attributable to AMCON, net of tax | 770,365 | 335,339
Team Sledd | Equity method investment |  |
EQUITY METHOD INVESTMENT |  |
Total external revenue | 181,417,094 | 164,568,084
Gross profit | 9,817,979 | 7,847,390
Net income before income taxes | 2,074,836 | 1,003,793
Net income attributable to AMCON, net of tax | $ 770,365 | $ 335,339

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