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Note 9 - Employee Retirement Plans (Details Textual) - USD ($) shares in Thousands, $ in Thousands |  | 3 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2021 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2023
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  |  | $ 1,603 | $ 1,603 | $ 1,603 |
Pension and Other Postretirement Benefits Expense (Reversal of Expense), Noncash |  |  |  | (2,313) | $ 0 | 0 |
Defined Benefit Plan Concentration Risk Assets Equity Securities Difference Plan Assets And Liabilities |  |  |  |  | 25.00% |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase for Purchase |  |  |  | 3,000 | $ 3,000 |  |
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year |  | $ 0 |  | $ 0 |  |  | $ 0
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  | 5.25% |  | 5.25% | 5.47% |  | 5.25%
Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  |  |  |  |  | $ 0
Defined Benefit Plan, Benefit Obligation, Payment for Settlement |  | $ 2,200 | $ 11,800 |  |  |  |
Pension and Other Postretirement Benefits Expense (Reversal of Expense), Noncash |  | $ 500 | $ (1,800) |  |  |  |
Supplemental Employee Retirement Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  |  | $ 1,600 | $ 1,600 | 1,600 |
Defined Contribution Saving Plan, A401 K [Member] |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  |  | $ 400 | $ 300 | $ 100 |
Defined Contribution Plan, Percent, Contributed By Employee Minimum |  |  |  | 2.00% |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  |  |  | 75.00% |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% |  |  |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00% |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Employer, Related Party, Number of Shares (in shares) |  | 0 |  | 0 | 0 |  | 0
Multinational Retirement Plan [Member] |  |  |  |  |  |  |
Defined Contribution Plan, Percent, Contributed By Employee Minimum |  |  |  | 1.00% |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  |  |  | 50.00% |  |  |
Merchant Navy Officers Pension Fund [Member] |  |  |  |  |  |  |
Postemployment Benefits Liability |  | $ 1,500 |  | $ 1,500 | $ 1,300 |  | $ 1,500
Postemployment Benefits, Period Expense |  |  |  | $ 200 |  |  |

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- Definition Represents the minimum percent contributed by employee under the defined contribution plan. + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + 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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(10) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Number of shares of employer stock in which defined benefit plan asset is invested. Includes, but is not limited to, stock issued or managed by related party of employer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (n) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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