Note 9 - Employee Retirement Plans (Details Textual) - USD ($) shares in Thousands, $ in Thousands	2 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 1,603	$ 1,603	$ 1,615
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
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year		$ 0
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.85%	5.47%	2.85%
Pension Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 0
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer		1,600
Defined Contribution Saving Plan, A401 K [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 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
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	$ 1,300	$ 900
Postemployment Benefits, Period Expense			$ 200