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Note 8 - Stockholders' Equity (Tables) | 9 Months Ended
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Dec. 31, 2022
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Stock-based compensation expense |  | $ | 2,056 |  |  | $ | 3,703 |  |  | $ | 9,859 |  |  | $ | 7,939 |
Amount of income tax (benefit) recognized in earnings |  |  | 226 |  |  |  | (743 | ) |  |  | (1,855 | ) |  |  | (4,247 | )
Stock-based compensation expense, net of tax |  | $ | 2,282 |  |  | $ | 2,960 |  |  | $ | 8,004 |  |  | $ | 3,692 |
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, 2022 |  |  | 202 |  |  | $ | 167.14 |  |  |  | 2.9 |  |  | $ | 18,261 |
Awards granted |  |  | 43 |  |  |  | 185.61 |  |  |  |  |  |  |  |  |
Awards forfeited or expired |  |  | (7 | ) |  |  | 225.12 |  |  |  |  |  |  |  |  |
Awards exercised |  |  | (45 | ) |  |  | 100.19 |  |  |  |  |  |  |  |  |
Outstanding as of December 31, 2022 |  |  | 193 |  |  | $ | 184.70 |  |  |  | 3.1 |  |  | $ | 3,406 |
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, 2022(1) |  |  | 51 |  |  | $ | 252.86 |  |  |  | 55 |  |  | $ | 288.45 |
Awards granted(1) |  |  | 42 |  |  |  | 187.45 |  |  |  | 19 |  |  |  | 179.63 |
Performance adjustment(2) |  |  | - |  |  |  | - |  |  |  | 2 |  |  |  | 202.00 |
Awards forfeited |  |  | (8 | ) |  |  | 232.20 |  |  |  | - |  |  |  | - |
Awards distributed(2) |  |  | (26 | ) |  |  | 250.81 |  |  |  | (10 | ) |  |  | 202.00 |
Outstanding as of December 31, 2022(1) |  |  | 59 |  |  | $ | 210.44 |  |  |  | 66 |  |  | $ | 267.97 |

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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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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