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Note 8 - Subsequent Events (Details Textual) - USD ($) |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 17, 2025 | Mar. 31, 2025 | May 28, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Mar. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  | 5,000 | 143,303 |
ATM Agreement [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 800 |  | 1,304,260 |  |
Proceeds from Issuance of Common Stock |  | $ 1,746 |  | $ 2,100,000 | $ 2,000 | $ 0
Subsequent Event [Member] | Share-Based Payment Arrangement, Employee [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | 5,000 |  |  |  |  |
Subsequent Event [Member] | Share-Based Payment Arrangement, Employee [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares) | 1,250 |  |  |  |  |
Subsequent Event [Member] | Share-Based Payment Arrangement, Employee [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) | 10 years |  |  |  |  |
Subsequent Event [Member] | ATM Agreement [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 289,144 |  |  |
Proceeds from Issuance of Common Stock |  |  | $ 600,000 |  |  |

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