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LEASES - Operating lease costs (Details) - USD ($)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Operating lease costs:    
Fixed lease cost $ 1,185,576 $ 430,886
Variable lease cost 448,983 454,422
Short-term lease cost 401,526 101,916
Sublease income (84,473) (81,993)
Total operating lease costs $ 1,951,612 $ 905,231