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Note 8 - Stockholders' Equity (Tables) | 9 Months Ended
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Dec. 31, 2023
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Stock-based compensation expense |  | $ | 2,993 |  |  | $ | 2,056 |  |  | $ | 9,144 |  |  | $ | 9,859 |
Amount of income tax expense (benefit) recognized in earnings |  |  | 210 |  |  |  | 226 |  |  |  | 727 |  |  |  | (1,855 | )
Stock-based compensation expense, net of tax |  | $ | 3,203 |  |  | $ | 2,282 |  |  | $ | 9,871 |  |  | $ | 8,004 |
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, 2023 |  |  | 163 |  |  | $ | 200.62 |  |  |  | 3.3 |  |  | $ | 1,643 |
Awards granted |  |  | 53 |  |  |  | 131.67 |  |  |  |  |  |  |  |  |
Awards forfeited or expired |  |  | (17 | ) |  |  | 208.03 |  |  |  |  |  |  |  |  |
Awards exercised |  |  | (2 | ) |  |  | 132.40 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2023 |  |  | 197 |  |  | $ | 182.12 |  |  |  | 3.5 |  |  | $ | - |
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, 2023(1) |  |  | 57 |  |  | $ | 209.27 |  |  |  | 44 |  |  | $ | 286.02 |
Awards granted(1) |  |  | 54 |  |  |  | 134.03 |  |  |  | 32 |  |  |  | 132.29 |
Awards forfeited |  |  | (5 | ) |  |  | 171.83 |  |  |  | - |  |  |  | - |
Awards distributed |  |  | (27 | ) |  |  | 212.36 |  |  |  | - |  |  |  | - |
Outstanding as of December 31, 2023(1) |  |  | 79 |  |  | $ | 158.94 |  |  |  | 76 |  |  | $ | 223.07 |

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