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Advances to Suppliers - Movement of allowance for doubtful accounts (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Advances to Suppliers    
Balance at beginning of period $ 3,717,708 $ 3,699,890
Change of allowance for doubtful accounts (405,198) (53,436)
Write off   (15,631)
Translation adjustments (166,949) 86,885
Balance at end of period 3,145,561 3,717,708
Advances to Suppliers    
Advances to Suppliers    
Balance at beginning of period 38,746 179,095
Change of allowance for doubtful accounts 21,521 (144,549)
Write off (18,565) (5)
Translation adjustments (2,574) 4,205
Balance at end of period $ 39,128 $ 38,746