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LEASES - Lease assets and liabilities (Details) - USD ($)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Assets:    
Operating lease right-of-use assets $ 2,350,929 $ 1,729,112
Liabilities:    
Operating lease liabilities, current (599,898) (336,765)
Operating lease liabilities, non-current (1,857,894) (1,482,569)
Total lease liabilities $ (2,457,792) $ (1,819,334)
Operating leases 3 years 4 months 2 days 4 years 6 months 3 days
Operating leases 28.00% 28.00%
Cash paid for amounts included in the measurement of lease liabilities for the fiscal year ended September 30, 2021, and 2020 $ 1,057,438 $ 1,096,054