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Note 8 - Employee Retirement Plans (Details Textual) - USD ($) shares in Thousands, $ in Thousands | 2 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | $ 1,603 | $ 1,615 | $ 5,027
Defined Benefit Plan Concentration Risk Assets Equity Securities Difference Plan Assets And Liabilities | 25.00% | 25.00% |  |
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year | $ 0 | $ 0 |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 2.85% | 2.85% | 2.50% |
Defined Contribution Plan Company Contribution Percentage |  | 3.00% |  |
Pension Plan [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | $ 0 | $ 0 | 1,100
Supplemental Employee Retirement Plan [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | $ 1,600 | $ 1,600 | $ 3,200
Retirement Plans Contributions [Member] |  |  |  |
Defined Contribution Plan Company Contribution Vesting Period (Year) |  | 5 years |  |
Defined Contribution Saving Plan, A401 K [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | $ 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 |
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, Total | $ 900 | $ 900 | $ 700 |
Postemployment Benefits, Period Expense |  | $ 200 |  |

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- Definition Represents the concentration risk percentage of equity securities under the defined benefit plan. + References No definition available. + Details
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- Definition Represents the company contribution percentage under defined contribution plan. + References No definition available. + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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