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Note 7 - Stockholders' Equity (Tables) | 6 Months Ended
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Sep. 30, 2025
Notes Tables |
Share-Based Payment Arrangement, Activity [Table Text Block] |
|  | Time-Based Restricted Stock Units |  |  | Performance-Based Restricted Stock Units |
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value per Share |  |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value per Share |
Nonvested as of March 31, 2025 |  |  | 145 |  |  | $ | 106.54 |  |  |  | 85 |  |  | $ | 166.31 |
Awards granted(1) |  |  | 108 |  |  |  | 90.87 |  |  |  | 44 |  |  |  | 99.56 |
Awards forfeited |  |  | (5 | ) |  |  | 98.14 |  |  |  | - |  |  |  | - |
Awards distributed |  |  | (62 | ) |  |  | 116.85 |  |  |  | (4 | ) |  |  | 174.73 |
Nonvested as of September 30, 2025 |  |  | 186 |  |  | $ | 94.13 |  |  |  | 125 |  |  | $ | 142.39 |

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