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Note 8 - Stockholders' Equity (Tables) | 9 Months Ended
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Dec. 31, 2020
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Stock-based compensation expense |  | $ | 3,611 |  |  | $ | 3,260 |  |  | $ | 6,887 |  |  | $ | 5,310 |
Amount of income tax expense (benefit) recognized in earnings |  |  | 320 |  |  |  | (78 | ) |  |  | (1,127 | ) |  |  | (986 | )
Stock-based compensation expense, net of tax |  | $ | 3,931 |  |  | $ | 3,182 |  |  | $ | 5,760 |  |  | $ | 4,324 |
Stock-based compensation expense is included in cost of revenues, selling, general and administrative, and research and development expense in the accompanying unaudited Condensed Consolidated Statements of Operations.
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Stock Options |
|  | Shares Subject to Options |  |  | Weighted- Average Exercise Price per Share |
Outstanding at March 31, 2020 |  |  | 286 |  |  | $ | 107.72 |
Awards granted |  |  | 36 |  |  |  | 226.72 |
Awards forfeited or expired |  |  | (12 | ) |  |  | 116.24 |
Awards exercised |  |  | (47 | ) |  |  | 85.64 |
Outstanding as of December 31, 2020 |  |  | 263 |  |  | $ | 127.63 |
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 at March 31, 2020 |  |  | 28 |  |  | $ | 180.15 |  |  |  | 22 |  |  | $ | 204.68 |
Awards granted |  |  | 21 |  |  |  | 230.36 |  |  |  | - |  |  |  | - |
Awards forfeited or expired |  |  | (3 | ) |  |  | 204.40 |  |  |  | (1 | ) |  |  | 199.50 |
Awards distributed |  |  | (8 | ) |  |  | 196.38 |  |  |  | - |  |  |  | - |
Nonvested as of December 31, 2020 |  |  | 38 |  |  | $ | 203.29 |  |  |  | 21 |  |  | $ | 204.80 |

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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