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Note 7 - Stockholders' Equity (Tables) | 6 Months Ended
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Sep. 30, 2019
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Six Months Ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Stock-based compensation expense |  | $ | 1,182 |  |  | $ | 990 |  |  | $ | 2,050 |  |  | $ | 1,729 |
Amount of income tax (benefit) recognized in earnings |  |  | (368 | ) |  |  | 38 |  |  |  | (908 | ) |  |  | (858 | )
Stock-based compensation expense (benefit), net of tax |  | $ | 814 |  |  | $ | 1,028 |  |  | $ | 1,142 |  |  | $ | 871 |
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 |  |  |  | 205.46 |  |  |  | 19 |  |  |  | 202.09 |
Awards forfeited or expired |  |  | (27 | ) |  |  | 99.36 |  |  |  | (2 | ) |  |  | 156.14 |
Awards exercised or distributed |  |  | (40 | ) |  |  | 84.54 |  |  |  | (3 | ) |  |  | 155.62 |
Outstanding as of September 30, 2019 |  |  | 316 |  |  | $ | 104.89 |  |  |  | 45 |  |  | $ | 180.13 |

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