Note 9 - Share-based Compensation - Summary of Non-vested Options (Details) - $ / shares |
12 Months Ended | |
|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Nonvested (in shares) | 125,000 | |
| Nonvested, weighted average grant-date fair value (in dollars per share) | $ 1.16 | |
| Granted (in shares) | 50,000 | 50,000 |
| Granted, weighted average grant-date fair value (in dollars per share) | $ 0.15 | |
| Vested (in shares) | (75,000) | |
| Vested, weighted average grant-date fair value (in dollars per share) | $ 1.28 | |
| Nonvested (in shares) | 100,000 | 125,000 |
| Nonvested, weighted average grant-date fair value (in dollars per share) | $ 0.56 | $ 1.16 |