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Note 4 - Equity (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Mar. 31, 2025
Notes Tables |  |
Restricted Stock Expenses, General and Administrative [Table Text Block] |
|  | Three Months Ended June 30, |
|  | 2025 |  |  | 2024 |
Recognized in general and administrative expense |  | $ | — |  |  | $ | 33,250 |
Total |  | $ | — |  |  | $ | 33,250 |
|  | Year ended March 31, |
|  | 2025 |  |  | 2024 |
Recognized in general and administrative expense |  | $ | 116,375 |  |  | $ | 16,625 |
Total |  | $ | 116,375 |  |  | $ | 16,625 |
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |  |
|  |  |  |  |  | Grant Date |
|  | Number of Shares |  |  | Fair Value Per Share |
Outstanding, March 31, 2024 |  |  | 1,604 |  |  | $ | 76.00 |
Granted |  |  | — |  |  | $ | — |
Vested |  |  | (1,604 | ) |  | $ | 76.00 |
Outstanding, March 31, 2025 |  |  | — |  |  | $ | — |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  | Weighted- Average |
|  |  |  |  |  | Exercise Price |
|  | Options |  |  | Per Share |
Outstanding, March 31, 2025 |  |  | 243,483 |  |  | $ | 32.72 |
Granted |  |  | 5,000 |  |  |  | 1.85 |
Exercised |  |  | - |  |  |  | - |
Forfeited/Cancelled |  |  | - |  |  |  | - |
Expired |  |  | - |  |  |  | - |
Outstanding, June 30, 2025 |  |  | 248,483 |  |  | $ | 32.10 |
Exercisable, June 30, 2025 |  |  | 69,916 |  |  | $ | 37.24 |
|  | Options |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Life (In Years) |  |  | Aggregate Intrinsic Value* |
Outstanding, March 31, 2024 |  |  | 100,180 |  |  | $ | 46.59 |  |  |  | 9.35 |  |  | $ | 1,680,672 |
Granted |  |  | 143,303 |  |  |  | 23.02 |  |  |  | — |  |  |  | — |
Exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Forfeited/Cancelled |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Outstanding, March 31, 2025 |  |  | 243,483 |  |  | $ | 32.72 |  |  |  | 8.92 |  |  | $ | - |
Exercisable, March 31, 2025* |  |  | 37,923 |  |  | $ | 44.35 |  |  |  | 8.20 |  |  | $ | - |
Share-Based Payment Arrangement, Outstanding Award, Activity, Excluding Option [Table Text Block] |
|  |  |  |  |  | Weighted- Average |
|  |  |  |  |  | Exercise Price |
|  | Warrants |  |  | Per Share |
Outstanding, March 31, 2025 |  |  | 1,934,874 |  |  | $ | 5.8860 |
Granted |  |  | - |  |  |  | - |
Exercised |  |  | (222,132 | ) |  |  | 0.0010 |
Forfeited/Cancelled |  |  | (130 | ) |  |  | 0.0010 |
Expired |  |  | - |  |  |  | - |
Outstanding, June 30, 2025* |  |  | 1,712,612 |  |  | $ | 6.6498 |
Exercisable, June 30, 2025 |  |  | 1,712,612 |  |  | $ | 6.6498 |
|  | Warrants |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Life (In Years) |  |  | Aggregate Intrinsic Value* |
Outstanding and exercisable, March 31, 2024 |  |  | 287,231 |  |  | $ | 1.64 |  |  |  | 4.80 |  |  | $ | 17,072,147 |
Granted |  |  | 2,542,677 |  |  |  | 4.31 |  |  |  | — |  |  |  | — |
Exercised** |  |  | (892,432 | ) |  |  | 0.04 |  |  |  | — |  |  |  | — |
Forfeited/Cancelled |  |  | (2,602 | ) |  |  | 0.20 |  |  |  | — |  |  |  | — |
Expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Outstanding, March 31, 2025 |  |  | 1,934,874 |  |  | $ | 5.89 |  |  |  | 4.09 |  |  | $ | 532,060 |
Exercisable, March 31, 2025 |  |  | 1,842,889 |  |  | $ | 5.67 |  |  |  | 4.06 |  |  | $ | 532,060 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |  |
|  | Range |
|  | 2025 |  |  | 2024 |
Fair value of common stock on the measurement date (per share) |  |  | – |  |  | $2.00 | to | 5.00 |
Discount rate based on the daily yield curve rates for U.S. Treasury obligations |  |  | – |  |  | 4.04% | to | 4.54% |
Expected life (in years) |  |  | – |  |  | 3 | to | 5 |
Expected volatility based on the historical volatility of comparable companies' stock |  |  | – |  |  | 104% | to | 119% |

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