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Note 8 - Benefit Plans (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) yr | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Defined Benefit Plans Number of Plans | 2 |  |
Defined Benefit Plans Retirement Age (Year) | yr | 65 |  |
Defined Benefit Plan, Termination Charge | $ 7,821 | $ 0 | $ 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total | (15,108) | (14,361) |
Other Assets [Member] | Nonqualified Plan [Member] |  |  |
Cash Surrender Value of Life Insurance | 7,900 | 5,000 |
Other Noncurrent Liabilities [Member] | Nonqualified Plan [Member] |  |  |
Deferred Compensation Liability, Classified, Noncurrent, Total | 7,800 | 4,800 |
Noncontributory Qualified Defined Pension Plans [Member] |  |  |
Defined Benefit Plan, Benefit Obligation, Payment for Settlement | 14,300 |  |
Defined Benefit Plan, Termination Charge | 7,800 |  |
Defined Benefit Plan, Remaining Undistributed Asset Surplus | 400 |  |
Noncontributory Qualified Defined Pension Plans [Member] | Annuitization Benefit [Member] |  |  |
Guaranteed Benefit Liability, Net, Ending Balance | 3,100 |  |
Supplemental Employee Retirement Plan [Member] |  |  |
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total | (15,523) | (14,337) |
Defined Benefit Plan, Expected Amortization, Next Fiscal Year, Total | 1,700 |  |
Postretirement Life Insurance [Member] |  |  |
Cash Surrender Value of Life Insurance | 4,600 | 4,000 |
Postretirement Life Insurance [Member] | Life Insurance Contracts [Member] |  |  |
Gain (Loss) on Investments, Total | $ 600 | 500 | 700
401(K) Plan [Member} |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 25.00% |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 1,600 |  | 1,600
Defined Contribution Plan, Increase (Decrease), Cost |  |  | $ (1,200)
Gain (loss) on Employer Matching Contribution, Amount |  | $ 300 |

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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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