Shareholders equity (Details Narrative) - USD ($) |
1 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Apr. 08, 2025 |
Apr. 04, 2025 |
Oct. 10, 2024 |
Aug. 31, 2025 |
Apr. 30, 2025 |
Jan. 30, 2023 |
Sep. 30, 2025 |
Sep. 30, 2024 |
Sep. 30, 2023 |
May 19, 2025 |
Jan. 18, 2024 |
|
| Unsecured convertible note principal amount | $ 3,230,000 | $ 3,149,750 | |||||||||
| Purchase price | 2,925,000 | ||||||||||
| Original Issue Discount | 210,000 | 204,750 | |||||||||
| Transaction expense amount | $ 20,000 | ||||||||||
| Debt Issuance Costs | $ 20,000 | ||||||||||
| Aggregate purchase amount | $ 20,000,000 | ||||||||||
| Interest rate | 7.00% | 7.00% | 6.50% | ||||||||
| Shares Issued Upon Conversion | 609,221 | 177,067 | 11,996 | ||||||||
| Redemption of convertible notes | $ 3,210,000 | $ 2,420,000 | $ 1,250,000 | ||||||||
| Statutory reserves | $ 11,404 | $ 14,990 | |||||||||
| CN Energy [Member] | |||||||||||
| Underwriting agreement, Description | public offering (the “Offering”) (i) 10,396,974 units, each consisting of one Class A ordinary share, no par value (collectively, the “Class A ordinary shares”) and one warrant, each exercisable to purchase one Class A ordinary share at an exercise price of $0.55 per share (collectively, the “warrants”), at an offering price of $0.55 per unit; and (ii) 7,786,300 units, each consisting of one pre-funded warrant, each exercisable to purchase one Class A ordinary share at an exercise price of $0.0001 per share (collectively, the “Pre-funded Warrants”), and one warrant, at an offering price of $0.5499 per unit (together with the Class A ordinary shares and the warrants, the “Offered Securities”), to those purchasers whose purchase of Class A ordinary shares in the Offering would otherwise result in the purchaser, together with its affiliates and certain related parties, beneficially owning more than 4.99% (or, at the election of the holder, 9.99%) of CN Energy’s outstanding ordinary shares immediately following the consummation of the Offering. The components of the units were issued separately and are immediately separable upon issuance | ||||||||||
| Proceeds from the Offering | $ 7,800,000 | ||||||||||
| Common Class A [Member] | |||||||||||
| Issuance of stock | 15,069,674 | ||||||||||
| Additional share issued for reverse split | 1,597,444 | ||||||||||
| Ordinary shares, issued | 10,396,974 | 3,010,000.00 | 75,280,000 | ||||||||
| Pre-funded Warrants outstanding | 3,112,046 | 1,554 | 1,554 | ||||||||
| Weighted average number of shares outstanding | 271,333 | ||||||||||
| Pre-funded Warrants exercised | 4,672,700 | 3,112,046 | |||||||||
| Number of Warrants outstanding | 3,012,094 | 6,783,337 | |||||||||
| Number of warrants exercised | 1,635,000 | 100,000 | |||||||||
| Common Class A [Member] | Ynong Group [Member] | |||||||||||
| Share issued for acquisition | 4,500 | ||||||||||
| Share issued for acquisition, value | $ 10,000,000 | ||||||||||
| Ordinary shares, issued | 50,000,000 | ||||||||||
| Common Class A [Member] | Bottom [Member] | |||||||||||
| Warrants exercise price | $ 1.4529 | $ 0.55 | |||||||||
| Warrants | 3,012,094 | 6,883,337 | |||||||||
| Common Class A [Member] | Top [Member] | |||||||||||
| Warrants exercise price | $ 2.6584 | $ 1.4529 | |||||||||
| Warrants | 6,883,337 | 18,183,274 | |||||||||
| Common Class A [Member] | Class A Purchase Agreement [Member] | |||||||||||
| Aggregate share issued | 1,977,302 | ||||||||||
| Price per share | $ 2.30 | ||||||||||
| Aggregate purchase price | $ 4,547,800 | ||||||||||
| Common Class B [Member] | |||||||||||
| Ordinary shares, issued | 4,028 | 100,698 | |||||||||
| Number of ordinary shares outstanding | 4,028 | 100,698 | |||||||||
| Common Class B [Member] | Class B Purchase Agreement [Member] | |||||||||||
| Aggregate share issued | 631,391 | ||||||||||
| Price per share | $ 2.30 | ||||||||||
| Aggregate purchase price | $ 1,452,200 | ||||||||||