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TAXES - Income before income taxes (Details) - USD ($)
12 Months Ended
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