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Note 8 - Stockholders' Equity (Tables) | 6 Months Ended
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Sep. 30, 2024
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 |
Outstanding as of March 31, 2024 |  |  | 76 |  |  | $ | 157.83 |  |  |  | 56 |  |  | $ | 240.96 |
Awards granted(1) |  |  | 111 |  |  |  | 93.05 |  |  |  | 41 |  |  |  | 102.57 |
Awards forfeited |  |  | (4 | ) |  |  | 137.89 |  |  |  | - |  |  |  | - |
Awards distributed |  |  | (34 | ) |  |  | 165.50 |  |  |  | - |  |  |  | - |
Outstanding as of September 30, 2024 |  |  | 149 |  |  | $ | 108.40 |  |  |  | 97 |  |  | $ | 181.85 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Stock Options |
|  | Shares Subject to Options |  |  | Weighted- Average Exercise Price per Share |  |  | Weighted-Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value |
Outstanding as of March 31, 2024 |  |  | 194 |  |  | $ | 181.89 |  |  |  | 3.2 |  |  | $ | 26 |
Awards granted |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Awards forfeited or expired |  |  | (14 | ) |  |  | 147.90 |  |  |  |  |  |  |  |  |
Awards exercised |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Outstanding as of September 30, 2024 |  |  | 180 |  |  | $ | 184.42 |  |  |  | 2.9 |  |  | $ | 229 |

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