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Note 7 - Stockholders' Equity (Tables) | 9 Months Ended
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Dec. 31, 2019
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Stock-based compensation expense |  | $ | 3,260 |  |  | $ | 695 |  |  | $ | 5,310 |  |  | $ | 2,424 |
Amount of income tax (benefit) recognized in earnings |  |  | (78 | ) |  |  | (160 | ) |  |  | (986 | ) |  |  | (1,018 | )
Stock-based compensation expense, net of tax |  | $ | 3,182 |  |  | $ | 535 |  |  | $ | 4,324 |  |  | $ | 1,406 |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Stock Options |  |  | Restricted Stock Units |
|  | Shares Subject to Options |  |  | Weighted- Average Exercise Price per Share |  |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value per Share |
Outstanding at March 31, 2019 |  |  | 354 |  |  | $ | 94.04 |  |  |  | 31 |  |  | $ | 162.23 |
Awards granted |  |  | 29 |  |  |  | 205.87 |  |  |  | 28 |  |  |  | 213.33 |
Awards forfeited or expired |  |  | (28 | ) |  |  | 99.69 |  |  |  | (2 | ) |  |  | 160.55 |
Awards exercised or distributed |  |  | (42 | ) |  |  | 85.35 |  |  |  | (5 | ) |  |  | 168.58 |
Outstanding as of December 31, 2019 |  |  | 313 |  |  | $ | 105.03 |  |  |  | 52 |  |  | $ | 189.17 |

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