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Note 11 - Stock Transactions and Stock-based Compensation (Tables) | 12 Months Ended
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Mar. 31, 2021
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Year Ended March 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Stock-based compensation expense |  | $ | 9,268 |  |  | $ | 5,525 |  |  | $ | 4,212 |
Amount of income tax (benefit) recognized in earnings |  |  | (1,816 | ) |  |  | (1,576 | ) |  |  | (2,370 | )
Stock-based compensation expense, net of tax |  | $ | 7,452 |  |  | $ | 3,949 |  |  | $ | 1,842 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Risk-free interest rate |  |  | 0.27 | % |  |  | 1.80 | % |  |  | 2.63 | %
Expected life (years) |  |  | 3.86 |  |  |  | 4.33 |  |  |  | 5.00 |
Expected dividend yield |  |  | 0.10 | % |  |  | 0.13 | % |  |  | 0.45 | %
Volatility |  |  | 38.83 | % |  |  | 36.52 | % |  |  | 35.96 | %
Weighted-average Black-Scholes fair value per share at date of grant |  | $ | 67.66 |  |  | $ | 66.02 |  |  | $ | 54.02 |
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 at March 31, 2020 |  |  | 286 |  |  | $ | 107.72 |  |  |  | 3.1 |  |  |  | 33,927 |
Awards granted |  |  | 36 |  |  |  | 226.72 |  |  |  |  |  |  |  |  |
Awards forfeited or expired |  |  | (13 | ) |  |  | 115.23 |  |  |  |  |  |  |  |  |
Awards exercised or distributed |  |  | (56 | ) |  |  | 84.40 |  |  |  |  |  |  |  |  |
Outstanding as of March 31, 2021 |  |  | 253 |  |  | $ | 129.55 |  |  |  | 2.7 |  |  | $ | 28,856 |
Exercisable as of March 31, 2021 |  |  | 121 |  |  | $ | 102.31 |  |  |  | 2.0 |  |  | $ | 17,155 |
Vested and expected to vest, March 31, 2021 |  |  | 246 |  |  | $ | 132.59 |  |  |  | 2.7 |  |  | $ | 28,847 |
Share-based Payment Arrangement, Activity [Table Text Block] |
|  | Time-Based Restricted Stock Units |
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value per Share |  |  | Weighted- average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value |
Nonvested at March 31, 2020 |  |  | 28 |  |  | $ | 180.15 |  |  |  | 1.7 |  |  | $ | 6,258 |
Awards granted |  |  | 22 |  |  |  | 231.61 |  |  |  |  |  |  |  |  |
Awards forfeited or expired |  |  | (3 | ) |  |  | 204.30 |  |  |  |  |  |  |  |  |
Awards distributed |  |  | (10 | ) |  |  | 189.01 |  |  |  |  |  |  |  |  |
Nonvested as of March 31, 2021 |  |  | 37 |  |  | $ | 206.56 |  |  |  | 1.1 |  |  | $ | 8,948 |
Share-based Payment Arrangement, Performance Shares, Activity [Table Text Block] |
|  | Performance-Based Restricted Stock Units |
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value per Share |  |  | Weighted- average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value |
Nonvested at March 31, 2020 at target |  |  | 22 |  |  | $ | 204.68 |  |  |  | 1.6 |  |  | $ | 4,903 |
Awards forfeited or expired at target |  |  | (2 | ) |  |  | 228.27 |  |  |  |  |  |  |  |  |
Nonvested as of March 31, 2021 at target |  |  | 20 |  |  | $ | 207.88 |  |  |  | 0.8 |  |  | $ | 4,884 |
Expected to vest |  |  | 34 |  |  | $ | 195.78 |  |  |  | 0.6 |  |  |  | 8,359 |

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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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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