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Note 12 - Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Deferred Compensation Arrangement with Individual, Recorded Liability | $ 0 | $ 0 |
Deferred Compensation Arrangement with Individual, Compensation Expense | 0 | 0 | $ 0
Deferred Compensation Plan Assets | 8,730 | 8,280 |
Stop-loss Insurance Liability for Individual Claims | 200 |  |
Stop-loss Insurance Liability for Aggregate Claims | 5,560 |  |
Other Postretirement Benefits Cost (Reversal of Cost) | $ 4,100 | $ 4,160 | $ 4,040
Common Stock, Shares Held in Employee Trust, Shares (in shares) | 266,533 | 282,072 | 309,019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 0 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) | 51,088 | 4,288 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 832 | $ 58 |
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | 0 |  |
Restricted Stock [Member] |  |  |
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $ 2,470 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year 10 months 28 days |  |
The 2022 Equity-based Compensation Plans [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | 1,000,000 |  |
Supplemental Employee Retirement Plan [Member] |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 35.00% |  |
Defined Benefit Plan, Employee Contribution, Age | 62 |  |
Directors' Plan [Member] |  |  |
Defined Benefit Plan, Employee Contribution, Age | 70 |  |
Defined Contribution Plan, Maximum Employee Contribution as Percentage of Base Salary | 100.00% |  |
401 (k) Savings Plan [Member] |  |  |
Defined Benefit Plan, Employer Matching Contributions | $ 1,890 | $ 1,760 | $ 1,820

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- Definition Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480637/718-40-25-12 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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