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Note 11 - Stock Transactions and Stock-based Compensation - Performance Stock Unit Activity (Details) - Performance Stock Units [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Nonvested (in shares) | 22 |  |
Nonvested, weighted average grant date fair value per share (in dollars per share) | $ 204.68 |  |
Nonvested, weighted average remaining contractual life (Year) | 9 months 18 days | 1 year 7 months 6 days |
Nonvested, aggregate intrinsic value | $ 4,884 | $ 4,903 |
Awards forfeited or expired (in shares) | (2) |  |
Awards granted, weighted average grant date fair value per share (in dollars per share) | $ 228.27 | $ 215.47 | $ 192.99
Nonvested (in shares) | 20 | 22 |
Nonvested, weighted average grant date fair value per share (in dollars per share) | $ 207.88 | $ 204.68 |
Expected to vest (in shares) | 34 |  |
Expected to vest, weighted average grant date fair value per share (in dollars per share) | $ 195.78 |  |
Expected to vest, weighted average remaining contractual life (Year) | 7 months 6 days |  |
Expected to vest, aggregate intrinsic value | $ 8,359 |  |

X
- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest equity based awards other than options outstanding. Includes, but is not limited to, unvested equity based awards for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References No definition available. + Details
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- Definition Number of fully vested and expected to vest equity instruments other than options outstanding that can be converted into shares + References No definition available. + Details
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- Definition Per share or unit weighted-average fair value of vested and expected to vest equity based awards under share-based payment arrangement. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest equity based awards other than options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options. + References No definition available. + Details
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