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Condensed financial information of the parent company - Balance Sheets - Parentheticals (Details) - $ / shares
Mar. 31, 2022
Mar. 30, 2022
Sep. 30, 2021
Jul. 22, 2021
Jul. 21, 2021
Mar. 31, 2021
Mar. 30, 2021
Sep. 12, 2020
Sep. 11, 2020
Parent Company Balance Sheets                  
Common stock, par or stated value per share (in dollars per share) $ 0.025 $ 0.001 $ 0.025 $ 0.001 $ 0.001     $ 0.001 $ 0.001
Common stock, shares authorized 24,000,000 600,000,000 24,000,000 600,000,000 200,000,000     200,000,000 20,000,000
Common stock, shares issued 23,906,985 597,780,383 22,311,215       557,780,383    
Common stock, shares outstanding 23,906,985 597,780,383 22,311,215     22,311,215 557,780,383    
Reportable legal entity | FAMI                  
Parent Company Balance Sheets                  
Common stock, par or stated value per share (in dollars per share) $ 0.025   $ 0.025            
Common stock, shares authorized 24,000,000   24,000,000            
Common stock, shares issued 23,906,985   22,311,215            
Common stock, shares outstanding 23,906,985   22,311,215