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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 | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Share-based compensation expense | $ 1,242 | $ 837 | $ 2,454 | $ 1,669
Stock Options and SARs [Member] |  |  |  |
Share-based compensation expense | 381 | 326 | 741 | 778
Restricted Stock [Member] |  |  |  |
Share-based compensation expense | 985 | 435 | 1,604 | 638
Performance Shares [Member] |  |  |  |
Share-based compensation expense | $ (124) | $ 76 | $ 109 | $ 253

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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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