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Summary of significant accounting policies - Consolidated Balance Sheets VIE (Details) - USD ($)
Mar. 31, 2022
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Variable Interest Entity [Line Items]        
Current assets excluding intercompany receivables $ 162,558,901 $ 155,305,536    
Current assets 162,558,901 155,305,536    
Non-current assets excluding investment in subsidiaries 12,239,354 10,381,365    
Non-current assets 12,239,354 10,381,365    
Total assets 174,798,255 165,686,901    
Current liabilities excluding intercompany payables 3,275,738 4,146,426    
Current liabilities 3,275,738 4,146,426    
Non-current liabilities 873,979 748,057    
Total liabilities 4,149,717 4,894,483    
Total shareholders' equity (net assets) 170,648,538 160,792,418 $ 39,218,841 $ 29,155,157
Other        
Variable Interest Entity [Line Items]        
Intercompany receivables 106,843,773 10,263,832    
Current assets excluding intercompany receivables 77,959,520 141,332,281    
Current assets 184,803,293 151,596,113    
Non-current assets excluding investment in subsidiaries 3,930,124 10,126,547    
Non-current assets 3,930,124 10,126,547    
Total assets 188,733,417 161,722,660    
Intercompany payables 162,478,017 151,314,338    
Current liabilities excluding intercompany payables 480,302 1,682,220    
Current liabilities 162,958,319 152,996,558    
Non-current liabilities 629,481 691,808    
Total liabilities 163,587,800 153,688,366    
Total shareholders' equity (net assets) 25,145,617 8,034,294    
WFOE (VIE)        
Variable Interest Entity [Line Items]        
Intercompany receivables 11,982,107 16,147,194    
Current assets excluding intercompany receivables 15,190,119 6,658,940    
Current assets 27,172,226 22,806,134    
Investment in subsidiaries 21,431,357 9,016,979    
Non-current assets 21,431,357 9,016,979    
Total assets 48,603,583 31,823,113    
Intercompany payables 20,794,381 4,809,089    
Current liabilities excluding intercompany payables 364,289 1,415    
Current liabilities 21,158,670 4,810,504    
Total liabilities 21,158,670 4,810,504    
Total shareholders' equity (net assets) 27,444,913 27,012,609    
VIE and its subsidiaries        
Variable Interest Entity [Line Items]        
Intercompany receivables 10,291,830 582,137    
Current assets excluding intercompany receivables 68,959,351 6,666,318    
Current assets 79,251,181 7,248,455    
Non-current assets excluding investment in subsidiaries 8,309,230 254,818    
Non-current assets 8,309,230 254,818    
Total assets 87,560,411 7,503,273    
Intercompany payables 84,379,932 3,785,283    
Current liabilities excluding intercompany payables 2,431,147 2,408,191    
Current liabilities 86,811,079 6,193,474    
Non-current liabilities 244,498 56,249    
Total liabilities 87,055,577 6,249,723    
Total shareholders' equity (net assets) 504,834 1,253,550    
FAMI        
Variable Interest Entity [Line Items]        
Intercompany receivables 140,204,080 134,585,007    
Current assets excluding intercompany receivables 449,911 647,997    
Current assets 140,653,991 135,233,004    
Total assets 140,653,991 135,233,004    
Intercompany payables 1,669,460 1,669,460    
Current liabilities excluding intercompany payables   54,600    
Current liabilities 1,669,460 1,724,060    
Total liabilities 1,669,460 1,724,060    
Total shareholders' equity (net assets) $ 138,984,531 $ 133,508,944