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Note 8 - Stockholders' Equity (Tables) | 6 Months Ended
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Sep. 30, 2020
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Six Months Ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Stock-based compensation expense |  | $ | 2,008 |  |  | $ | 1,182 |  |  | $ | 3,276 |  |  | $ | 2,050 |
Amount of income tax (benefit) recognized in earnings |  |  | (522 | ) |  |  | (368 | ) |  |  | (1,447 | ) |  |  | (908 | )
Stock-based compensation expense, net of tax |  | $ | 1,486 |  |  | $ | 814 |  |  | $ | 1,829 |  |  | $ | 1,142 |
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 |  |  | (10 | ) |  |  | 112.27 |
Awards exercised |  |  | (36 | ) |  |  | 83.69 |
Outstanding as of September 30, 2020 |  |  | 276 |  |  | $ | 126.30 |
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 |  |  | 19 |  |  |  | 225.32 |  |  |  | - |  |  |  | - |
Awards forfeited or expired |  |  | (3 | ) |  |  | 205.10 |  |  |  | (1 | ) |  |  | 199.50 |
Awards distributed |  |  | (5 | ) |  |  | 177.17 |  |  |  | - |  |  |  | - |
Nonvested as of September 30, 2020 |  |  | 39 |  |  | $ | 201.49 |  |  |  | 21 |  |  | $ | 204.80 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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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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