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Summary of significant accounting policies - Transfer from (Details)
Mar. 31, 2022
USD ($)
FAMI  
Variable Interest Entity [Line Items]  
Other subsidiaries $ 59,910
WFOE (VIE)  
Variable Interest Entity [Line Items]  
Consolidated VIE 3,280,144
Other subsidiaries 7,911,605
VIE and its subsidiaries  
Variable Interest Entity [Line Items]  
WFOE 4,567,844
Other subsidiaries 14,977,567
Other  
Variable Interest Entity [Line Items]  
Holding company 943,648
WFOE 3,524,104
Consolidated VIE $ 5,601,154