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Summary of significant accounting policies - Consolidated Statements of Operations and Comprehensive Income (Loss) VIE (Details) - USD ($)
 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Variable Interest Entity [Line Items]    
Revenues $ 42,135,715 $ 16,959,986
Cost of revenues (39,148,005) (14,133,327)
Gross profit 2,987,710 2,826,659
Operating expenses (3,602,406) (1,406,019)
Income (loss) from operations (614,696) 1,420,640
Other expenses 31,347 (63,303)
Income (loss) before income taxes (583,349) 1,397,174
Provision for income taxes (3,590) (17,628)
Net income (loss) (586,939) 1,379,546
Other    
Variable Interest Entity [Line Items]    
Revenues 31,295,055 14,408,483
Cost of revenues (28,722,969) (11,985,576)
Gross profit 2,572,086 2,422,907
Operating expenses (463,455) 228,373
Income (loss) from operations 2,108,631 2,651,280
Other expenses 52,050 (804)
Income (loss) before income taxes 2,160,681 2,650,476
Provision for income taxes (3,590) (1,449)
Net income (loss) 2,157,091 2,649,027
WFOE (VIE)    
Variable Interest Entity [Line Items]    
Revenues 1,635,180  
Cost of revenues (1,593,024)  
Gross profit 42,156  
Operating expenses (95,927) (7,759)
Income (loss) from operations (53,771) (7,759)
Other expenses 42,526 (16,591)
Income (loss) before income taxes (11,245) (24,350)
Net income (loss) (11,245) (24,350)
VIE and its subsidiaries    
Variable Interest Entity [Line Items]    
Revenues 9,205,480 2,551,503
Cost of revenues (8,832,012) (2,147,751)
Gross profit 373,468 403,752
Operating expenses (513,142) (359,128)
Income (loss) from operations (139,674) 44,624
Other expenses (61,369) (5,663)
Income (loss) before income taxes (201,043) 38,961
Provision for income taxes   (16,178)
Net income (loss) (201,043) 22,783
FAMI    
Variable Interest Entity [Line Items]    
Operating expenses (2,529,882) (1,267,506)
Income (loss) from operations (2,529,882) (1,267,506)
Other expenses (1,860) (408)
Income (loss) before income taxes (2,531,742) (1,267,914)
Net income (loss) $ (2,531,742) (1,267,914)
Discontinued operations.    
Variable Interest Entity [Line Items]    
Revenues   827,742
Cost of revenues   (666,486)
Gross profit   161,256
Operating expenses   (139,441)
Income (loss) from operations   21,815
Other expenses   (39,837)
Income (loss) before income taxes   (18,022)
Provision for income taxes   415
Net income (loss)   $ (17,607)