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Accounts receivable, net (Details) - USD ($)
Mar. 31, 2022
Sep. 30, 2021
Accounts receivable, net    
Accounts receivable - trade $ 19,160,519 $ 24,481,363
Accounts receivable - related party 21 49
Accounts receivable 19,160,540 24,481,412
Less: allowance for doubtful accounts (8,043) (8,094)
Accounts receivable $ 19,152,497 $ 24,473,318