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Variable interest entity (Details) - USD ($)
Jun. 30, 2023
Dec. 31, 2022
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Current assets belong to discontinued operation $ 32,925,040 $ 27,387,458
Other assets belong to discontinued operation 162,582 3,260,740
Total assets belong to discontinued operation 33,087,622 30,648,198
Total liabilities belong to discontinued operation (26,500,239) (24,146,516)
Net deficits belong to discontinued operation 6,940,575 6,577,119
Variable Interest Entity, Primary Beneficiary [Member]    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Current assets belong to discontinued operation 1,124,900 1,504,164
Other assets belong to discontinued operation 7,744,428 9,008,407
Total assets belong to discontinued operation 8,869,328 10,512,571
Total liabilities belong to discontinued operation (29,229,090) (27,769,551)
Net deficits belong to discontinued operation $ (20,359,762) $ (17,256,980)