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Prepayments and other current assets, net (Details) - USD ($)
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Prepayments and other current assets $ 1,483,209   $ 2,858,196      
Allowance for credit losses (249,128) $ (249,128) (249,128) $ 0 $ 0 $ 0
Advance To Suppliers [Member]            
Prepayments and other current assets 750,973   1,668,173      
Prepaid Income Taxes [Member]            
Prepayments and other current assets 41,987   45,718      
Prepaid Expenses And Other Receivables [Member]            
Prepayments and other current assets $ 939,377   $ 1,393,433