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EQUITY METHOD INVESTMENT - Equity investee's summarized financial data (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020
EQUITY METHOD INVESTMENT |  |
Net income (loss) attributable to AMCON, net of tax (1) |  | $ 183,579
Team Sledd |  |
EQUITY METHOD INVESTMENT |  |
Sales | $ 350,685,407 |
Gross profit | 14,218,204 |
Net income (loss) before income taxes (1) | 551,280 |
Net income (loss) attributable to AMCON, net of tax (1) | $ 183,579 | $ 200,000

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