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Bank acceptance notes payable (Details)
12 Months Ended
Jun. 15, 2020
USD ($)
Jun. 15, 2020
CNY (¥)
Sep. 30, 2021
Sep. 30, 2020
USD ($)
Jun. 15, 2020
CNY (¥)
Bank acceptance notes payable          
Bank acceptance notes       $ 3,234,000  
Xinyang Wang          
Bank acceptance notes payable          
Restricted cash to secure bank acceptance notes $ 1,620,000       ¥ 11,000,000
Nongyuan Network          
Bank acceptance notes payable          
Percentage of ownership interest 100.00% 100.00% 0.00%    
Hangzhou United Rural Commercial Bank Co., Ltd.          
Bank acceptance notes payable          
Bank acceptance notes $ 3,230,000       ¥ 22,000,000
Fees incurred related to the issuance of bank acceptance notes $ 1,620 ¥ 11,000