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Note 13 - Employee Retirement Plans (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Liability, Other Postretirement Defined Benefit Plan, Noncurrent | $ 14,650 | $ 17,170 |
Defined Benefit Plan, Benefit Obligation Actuarial Gain (Loss) Due to Pension Plan Termination | 0 |  |
Defined Contribution Plan, Cost | 4,999 | 4,334 | $ 3,899
Non Discretionary Employer Contributions | 0 | 0 | $ 0
Discretionary Contributions Made By Employer | 470 |  |
Assets for Plan Benefits, Defined Benefit Plan | $ 8,874 | 10,347 |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Requisite Service Period (Year) | 12 years |  |
Liability, Other Postretirement Defined Benefit Plan, Noncurrent | $ 5,230 | 6,031 |
Liability, Defined Benefit Plan, Current | $ 240 | $ 230 |
Defined Benefit Plan, Coverage Term (Year) | 10 years |  |
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year | 7.50% | 7.00% | 7.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate | 4.50% | 4.50% | 4.50%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 5.00% | 2.50% |
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate | 2031 | 2030 | 2029
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax | $ 3,013 |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | (132) | $ (38) | $ 28
Supplemental Non Qualified Plan [Member] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | 378 | 475 | 523
Liability, Defined Benefit Plan, Total | $ 9,420 | $ 11,139 | $ 9,318

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