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Note 11 - Stock Transactions and Stock-based Compensation - Allocation of Share-based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Stock-based compensation expense | [1] | $ 5,525 | $ 4,212 | $ 1,672
Amount of income tax (benefit) recognized in earnings |  | (1,576) | (2,370) | (1,194)
Stock-based compensation expense, net of tax |  | $ 3,949 | $ 1,842 | $ 478
[1] | During the year ended March 31, 2019, we implemented a new full-administration equity compensation platform, and as a result, changed the methodology used to account for estimated forfeitures from a static method to a dynamic method. This change resulted in a one-time cumulative increase in expense of $945, recognized during the year ended March 31, 2019.

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- Definition The total recognized tax expense (benefit) related to compensation cost for equity-based payment arrangements recognized in income during the period. + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: 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 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=115993241&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 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount, after tax, of expense for award under share-based payment arrangement. + References No definition available. + Details
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