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Note 5 - Stock-based Compensation (Details Textual) shares in Thousands | 6 Months Ended
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Jun. 30, 2024 shares
Restricted Stock [Member] | Employee [Member] | Maximum [Member] |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 4 years
Restricted Stock [Member] | Director [Member] | Maximum [Member] |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 3 years
Restricted Stock [Member] | Director [Member] | Minimum [Member] |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 1 year
Restricted Stock Units (RSUs) [Member] | Maximum [Member] |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 4 years
Restricted Stock Units (RSUs) [Member] | Minimum [Member] |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 3 years
Performance Shares [Member] |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 3 years
Share-Based Payment Arrangement [Member] |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 1,242
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Requiring Re-registration (in shares) | 256

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- Definition In reference to the number of shares requiring re-registration with the SEC. + References No definition available. + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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