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Note 12 - Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Deferred Compensation Arrangement with Individual, Recorded Liability | $ 0 | $ 0 |
Deferred Compensation Arrangement with Individual, Compensation Expense | 0 | 0 | $ 0
Deferred Compensation Plan Assets | 8,280 | 5,140 |
Stop-loss Insurance Liability for Individual Claims | 200 |  |
Stop-loss Insurance Liability for Aggregate Claims | 5,880 |  |
Other Postretirement Benefits Cost (Reversal of Cost) | $ 4,160 | $ 4,040 | $ 3,980
Common Stock, Shares Held in Employee Trust, Shares (in shares) | 282,072 | 309,019 | 320,164
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) | 4,288 | 7,575 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 58 | $ 83 |
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $ 80 |  |
Share-Based Payment Arrangement, Option [Member] |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 3 months |  |
Restricted Stock [Member] |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year 10 months 28 days |  |
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $ 2,470 |  |
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 | $ 1,760 | $ 1,820 | $ 1,710

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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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