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Note 7 - Share-based Compensation - Shared-based Compensation Expense and the Related Tax Benefit (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Share-based compensation expense | $ 1,212 | $ 832
Stock Options and SARs [Member] |  |
Share-based compensation expense | 360 | 452
Restricted Stock [Member] |  |
Share-based compensation expense | 619 | 203
Performance Shares [Member] |  |
Share-based compensation expense | $ 233 | $ 177

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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