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Summary of significant accounting policies - Consolidated Cash Flow VIE (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Variable Interest Entity [Line Items] |  |  |
Net cash provided by (used in) operating activities from continuing operations | $ (53,231,108) | $ (1,827,618) | $ (11,396,807)
Net cash used in investing activities from continuing operations | (12,127,728) | (82,195) | (56,421)
Net cash provided by (used in) financing activities from continuing operations | 122,665,288 | 3,200,229 | 6,695,882
Effect of exchange rate changes on cash and restricted cash | (153,454) | 71,112 | 41,497
Net increase (decrease) in cash and restricted cash | 57,152,998 | 1,361,528 | (4,715,849)
Cash and restricted cash from continuing operations, beginning of year | 2,098,906 | 737,378 | 5,453,227
Cash and restricted cash from continuing operations, end of year | 59,251,904 | 2,098,906 | 737,378
Other [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Net cash provided by (used in) operating activities from continuing operations | 67,709,967 | 57,809 | (4,761,687)
Net cash used in investing activities from continuing operations | (9,353,935) |  | (9,493)
Net cash provided by (used in) financing activities from continuing operations | 144,197 | 10,437 |
Effect of exchange rate changes on cash and restricted cash | (506,653) | 15,087 | 41,606
Net increase (decrease) in cash and restricted cash | 57,993,576 | 83,333 | (4,729,574)
Cash and restricted cash from continuing operations, beginning of year | 183,030 | 99,697 | 4,829,271
Cash and restricted cash from continuing operations, end of year | 58,176,606 | 183,030 | 99,697
Variable Interest Entity and Subsidiaries [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Net cash provided by (used in) operating activities from continuing operations | (338,559) | (1,629,913) | 31,661
Net cash used in investing activities from continuing operations | (1,363) | (82,195) | (46,928)
Net cash provided by (used in) financing activities from continuing operations | (1,232,191) | 3,567,505 |
Effect of exchange rate changes on cash and restricted cash | 94,714 | 56,006 | (91)
Net increase (decrease) in cash and restricted cash | (1,477,399) | 1,911,403 | (15,358)
Cash and restricted cash from continuing operations, beginning of year | 1,913,335 | 1,932 | 17,290
Cash and restricted cash from continuing operations, end of year | 435,936 | 1,913,335 | 1,932
Nongyuan Network |  |  |
Variable Interest Entity [Line Items] |  |  |
Net cash provided by (used in) operating activities from continuing operations | 3,246,067 | (560,411) | (27)
Net cash used in investing activities from continuing operations | (2,772,430) |  |
Net cash provided by (used in) financing activities from continuing operations | (616,095) | 560,358 |
Effect of exchange rate changes on cash and restricted cash | 258,485 | 19 | (18)
Net increase (decrease) in cash and restricted cash | 116,027 | (34) | (45)
Cash and restricted cash from continuing operations, beginning of year | 420 | 454 | 499
Cash and restricted cash from continuing operations, end of year | 116,447 | 420 | 454
FAMI |  |  |
Variable Interest Entity [Line Items] |  |  |
Net cash provided by (used in) operating activities from continuing operations | (123,848,583) | 304,897 | (6,666,754)
Net cash provided by (used in) financing activities from continuing operations | 124,369,377 | (938,071) | 6,695,882
Net increase (decrease) in cash and restricted cash | 520,794 | (633,174) | 29,128
Cash and restricted cash from continuing operations, beginning of year | 2,121 | 635,295 | 606,167
Cash and restricted cash from continuing operations, end of year | $ 522,915 | $ 2,121 | $ 635,295

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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