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Long-term investment - Additional information (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2022
USD ($)
director
Jan. 31, 2022
CNY (¥)
director
Aug. 31, 2021
USD ($)
director
Aug. 31, 2021
CNY (¥)
director
Mar. 31, 2023
USD ($)
Long-term investment          
Loss on equity investment | $         $ (724,428)
Medical Star          
Long-term investment          
Cash consideration     $ 308,385 ¥ 2,000,000  
Equity method investment, ownership percentage     20.00% 20.00%  
Loss on equity investment | $         14,899
Number of directors in board     7 7  
Number of directors can be appointed     3 3  
Voting power (in percent)     43.00% 43.00%  
Fujian Fishery          
Long-term investment          
Cash consideration $ 14,809,302 ¥ 94,012,410      
Equity method investment, ownership percentage 3.00% 3.00%      
Loss on equity investment | $         $ (739,327)
Number of directors in board 5 5      
Number of directors can be appointed 1 1      
Voting power (in percent) 20.00% 20.00%