Shareholders equity (Details Narrative) - USD ($) |
1 Months Ended | 6 Months Ended | 12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
Apr. 08, 2025 |
Apr. 04, 2025 |
Jan. 16, 2026 |
Jan. 30, 2023 |
Mar. 31, 2026 |
Mar. 31, 2025 |
Sep. 30, 2025 |
May 19, 2025 |
Jan. 18, 2024 |
Sep. 30, 2023 |
|
| Issuance of ordinary shares for warrants exercised, shares | 0 | 65,400 | ||||||||
| Original Issue Discount | $ 210,000 | |||||||||
| Transaction expense amount | 20,000 | |||||||||
| Unsecured convertible note principal amount | $ 3,230,000 | |||||||||
| Aggregate purchase amount | $ 20,000,000 | |||||||||
| Interest rate | 7.00% | 6.50% | ||||||||
| Interest expense | $ 814,928 | $ 54,738 | ||||||||
| Redemption of convertible notes | 3,010,000.00 | $ 2,760,000 | $ 2,760,000 | |||||||
| Statutory reserves | $ 11,404 | $ 11,404 | ||||||||
| Issuance of ordinary shares for convertible notes redemption, shares | 3,775,091 | 443,430 | ||||||||
| Issuance of ordinary shares for acquisition, shares | 2,857,143 | |||||||||
| Issuance of ordinary shares for acquisition, amount | $ 2,000,000 | |||||||||
| Secured Promissory Note [Member] | ||||||||||
| Principle amount | $ 7,510,000 | |||||||||
| Interest rate | 7.00% | |||||||||
| Original issue discount | 490,000 | |||||||||
| Transaction expenses | 20,000 | |||||||||
| Gross proceeds | 7,000,000 | |||||||||
| Note proceeds placed as collateral | $ 6,000,000.0 | |||||||||
| 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 | ||||||||
| Pre-funded Warrants outstanding | 3,112,046 | 1,554 | 1,554 | |||||||
| Pre-funded Warrants exercised | 4,672,700 | 3,112,046 | ||||||||
| Number of Warrants outstanding | 3,012,094 | 3,012,094 | ||||||||
| 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 | ||||||||