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Prepayments and other current assets (Details) - USD ($)
Sep. 30, 2022
Jun. 30, 2022
Prepaid Expense and Other Assets, Current $ 3,163,763 $ 5,444,463
Advance To Suppliers [Member]    
Prepaid Expense and Other Assets, Current 1,922,361 3,938,881
Prepaid Income Taxes [Member]    
Prepaid Expense and Other Assets, Current 214,818 375,087
Prepaid And Other [Member]    
Prepaid Expense and Other Assets, Current $ 1,026,584 $ 1,130,495