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LEASES - Operating lease costs (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Operating lease costs:        
Fixed lease cost $ 330,175 $ 327,409 $ 887,294 $ 1,066,680
Variable lease cost 85,298 158,399 147,120 418,999
Short-term lease cost   34,473   160,250
Sublease income (108,127) (46,144) (201,875) (152,431)
Total operating lease costs $ 307,346 $ 474,137 $ 832,539 $ 1,493,498