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Concentration and risks (Details Narrative) | 6 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Concentration Risk [Line Items] |  |
Credit risk description | the insurance coverage for cash deposits of each bank is RMB500,000. As of March 31, 2025, cash and restricted cash balance of RMB14,328,291 ($1,974,490) was deposited with financial institutions located in China, of which RMB12,610,367 ($1,737,755) was subject to credit risk. While management believes that these financial institutions are of high credit quality, it also continually monitors their credit worthiness. |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member] |  |
Concentration Risk [Line Items] |  |
concentration risk | 27.00% | 21.20%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customer [Member] |  |
Concentration Risk [Line Items] |  |
concentration risk | 22.60% | 15.20%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Three Customer [Member] |  |
Concentration Risk [Line Items] |  |
concentration risk | 16.10% | 11.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Vendor [Member] |  |
Concentration Risk [Line Items] |  |
concentration risk | 57.20% | 50.50%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member] |  |
Concentration Risk [Line Items] |  |
concentration risk | 22.40% | 21.90%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Two Customer [Member] |  |
Concentration Risk [Line Items] |  |
concentration risk | 13.60% | 13.70%
Accounts Payable [Member] | Customer Concentration Risk [Member] | One Vendor [Member] |  |
Concentration Risk [Line Items] |  |
concentration risk | 17.80% | 28.60%
Accounts Payable [Member] | Customer Concentration Risk [Member] | Two Vendor [Member] |  |
Concentration Risk [Line Items] |  |
concentration risk |  | 22.80%
Accounts Payable [Member] | Customer Concentration Risk [Member] | Three Vendor [Member] |  |
Concentration Risk [Line Items] |  |
concentration risk |  | 10.50%

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