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Accounts receivable, net (Details) - USD ($) | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | --- | --- | ---
Accounts receivable, net |  |  |  |
Accounts receivable - trade | $ 24,481,363 | $ 10,612,268 |  |
Accounts receivable - related party | 49 |  |  |
Accounts receivable | 24,481,412 | 10,612,268 |  |
Less: allowance for doubtful accounts | (8,094) | (119,199) | $ 0 | $ 0
Accounts receivable | $ 24,473,318 | $ 10,493,069 |  |

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