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Note 13 - Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Recorded Liability | $ 0 | $ 0 |
Deferred Compensation Arrangement with Individual, Compensation Expense | 0 | 0 | $ 0
Stop-loss Insurance Liability for Individual Claims | 200 |  |
Stop-loss Insurance Liability for Aggregate Claims | 6,000 |  |
Other Postretirement Benefits Cost (Reversal of Cost) | $ 4,170 | $ 3,970 | $ 3,720
Common Stock, Shares Held in Employee Trust, Shares (in shares) | 351,222 | 346,833 | 366,969
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) | (0) | 8,459 | 24,186
Share-based Payment Arrangement, Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  | $ 150 | $ 423
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares, Ending Balance (in shares) | 0 |  |
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 | $ 1,380 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year 9 months 29 days |  |
2012 Omnibus Incentive Compensation Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | 600,000 |  |
Share-based Compensation Arrangement By Share-based Payment Award, Maximum Exercise Period (Year) | 10 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 4 years |  |
2012 Omnibus Incentive Compensation Plan [Member] | Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 25.00% |  |
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 | $ 1,510 | $ 1,100 | $ 1,060

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- Definition Period from grant date that an equity-based award can be exercised, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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