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Note 7 - Stockholders' Equity (Tables) | 6 Months Ended
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Sep. 30, 2021
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Six Months Ended September 30, |
|  | 2022 |  |  | 2021 |  |  | 2021 |  |  | 2020 |
Stock-based compensation expense |  | $ | 2,039 |  |  | $ | 2,008 |  |  | $ | 4,236 |  |  | $ | 3,276 |
Amount of income tax (benefit) recognized in earnings |  |  | (719 | ) |  |  | (522 | ) |  |  | (3,504 | ) |  |  | (1,447 | )
Stock-based compensation expense, net of tax |  | $ | 1,320 |  |  | $ | 1,486 |  |  | $ | 732 |  |  | $ | 1,829 |
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, 2021 |  |  | 253 |  |  | $ | 129.55 |  |  |  | 2.7 |  |  | $ | 28,856 |
Awards granted |  |  | 37 |  |  |  | 268.85 |  |  |  |  |  |  |  |  |
Awards forfeited or expired |  |  | (3 | ) |  |  | 173.29 |  |  |  |  |  |  |  |  |
Awards exercised |  |  | (37 | ) |  |  | 94.49 |  |  |  |  |  |  |  |  |
Outstanding as of September 30, 2021 |  |  | 250 |  |  | $ | 154.16 |  |  |  | 2.9 |  |  | $ | 37,092 |
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, 2021(1) |  |  | 37 |  |  | $ | 206.56 |  |  |  | 20 |  |  | $ | 207.88 |
Awards granted |  |  | 29 |  |  |  | 267.09 |  |  |  | - |  |  |  | - |
Performance adjustment(2) |  |  | - |  |  |  | - |  |  |  | 16 |  |  |  | 190.07 |
Awards forfeited |  |  | (1 | ) |  |  | 210.22 |  |  |  | - |  |  |  | - |
Awards distributed |  |  | (19 | ) |  |  | 208.13 |  |  |  | (28 | ) |  |  | 197.81 |
Outstanding as of September 30, 2021(1) |  |  | 46 |  |  | $ | 244.45 |  |  |  | 8 |  |  | $ | 202.00 |

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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=122041274&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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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, 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 (d) -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 (e) -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 (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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