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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

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+ References

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- Definition

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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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.

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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

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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The carrying amount as of the balance sheet date of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement.

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