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Note 9 - Stock Transactions and Stock-based Compensation (Tables) | 12 Months Ended
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Mar. 31, 2025
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Year Ended March 31, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Stock-based compensation expense |  | $ | 13,142 |  |  | $ | 11,936 |  |  | $ | 12,538 |
Amount of income tax (benefit) recognized in earnings |  |  | 2,068 |  |  |  | 2,718 |  |  |  | (1,169 | )
Stock-based compensation expense, net of tax |  | $ | 15,210 |  |  | $ | 14,654 |  |  | $ | 11,369 |
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, 2024 |  |  | 76 |  |  | $ | 157.83 |  |  |  | 1.0 |  |  | $ | 8,325 |
Awards granted |  |  | 117 |  |  |  | 94.30 |  |  |  |  |  |  |  |  |
Awards forfeited |  |  | (11 | ) |  |  | 120.39 |  |  |  |  |  |  |  |  |
Awards distributed |  |  | (37 | ) |  |  | 169.12 |  |  |  |  |  |  |  | 3,928 |
Nonvested as of March 31, 2025 |  |  | 145 |  |  | $ | 106.54 |  |  |  | 1.0 |  |  | $ | 17,197 |
Expected to vest |  |  | 130 |  |  | $ | 107.29 |  |  |  | 1.1 |  |  | $ | 15,466 |
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, 2024 |  |  | 56 |  |  | $ | 240.96 |  |  |  | 2.6 |  |  | $ | 6,142 |
Awards granted |  |  | 42 |  |  |  | 102.57 |  |  |  |  |  |  |  |  |
Awards forfeited |  |  | (1 | ) |  |  | 112.24 |  |  |  |  |  |  |  |  |
Awards distributed |  |  | (12 | ) |  |  | 302.06 |  |  |  |  |  |  |  | 1,306 |
Nonvested as of March 31, 2025 |  |  | 85 |  |  | $ | 166.31 |  |  |  | 1.6 |  |  | $ | 10,101 |
Expected to vest |  |  | 81 |  |  | $ | 168.98 |  |  |  | 1.7 |  |  | $ | 9,654 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year Ended March 31, |
|  | 2024 |  |  | 2023 |
Weighted-average value at grant date |  | $ | 130.07 |  |  | $ | 185.60 |
Expected life (years) |  |  | 3.52 |  |  |  | 3.52 |
Expected dividend yield |  |  | 0.07 | % |  |  | 0.07 | %
Volatility |  |  | 37.82 | % |  |  | 37.29 | %
Risk-free interest rate |  |  | 4.16 | % |  |  | 3.55 | %
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, 2024 |  |  | 194 |  |  | $ | 181.89 |  |  |  | 3.2 |  |  | $ | 26 |
Awards granted |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Awards forfeited or expired |  |  | (17 | ) |  |  | 155.06 |  |  |  |  |  |  |  |  |
Awards exercised or distributed |  |  | (22 | ) |  |  | 123.17 |  |  |  |  |  |  |  | 24 |
Outstanding as of March 31, 2025 |  |  | 155 |  |  | $ | 192.92 |  |  |  | 2.7 |  |  | $ | 52 |
Exercisable awards as of March, 31, 2025 |  |  | 112 |  |  | $ | 211.36 |  |  |  | 2.2 |  |  | $ | 18 |
Exercisable awards and awards expected to vest, March 31, 2025 |  |  | 153 |  |  | $ | 193.71 |  |  |  | 2.7 |  |  | $ | 49 |

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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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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