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TAXES - Income before income taxes (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |
Income before income taxes | $ 3,363,277 | $ 5,805,349 | $ 6,941,919
China |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |
Income before income taxes | 3,252,583 | $ 5,805,349 | $ 6,941,919
Cayman Islands |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |
Income before income taxes | $ 110,694 |  |

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