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Note 7 - Share-based Compensation - Shared-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Share-based compensation expense | $ 1,340 | $ 1,242 | $ 2,420 | $ 2,454
Stock Options and SARs [Member] |  |  |  |
Share-based compensation expense | 390 | 381 | 699 | 741
Restricted Stock [Member] |  |  |  |
Share-based compensation expense | 767 | 985 | 1,357 | 1,604
Performance Shares [Member] |  |  |  |
Share-based compensation expense | $ 183 | $ (124) | $ 364 | $ 109

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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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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