Note 8 - Employee Retirement Plans (Details Textual) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		12 Months Ended
	Oct. 31, 2021	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan, Plan Assets, Contributions by Employer				$ 2,178	$ 1,599	$ 1,603
Pension and Other Postretirement Benefits Expense (Reversal of Expense), Noncash				$ 0	0	(2,313)
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				$ 2,500	200
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Sale				2,500	$ 2,900
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year				$ 0
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate				5.40%	5.65%
Pension Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer				$ 1,000	$ 200	0
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year				400
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				1,200	1,400	1,600
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year				1,200
Defined Contribution Saving Plan, A401 K [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer				$ 500	$ 500	400
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 (MNOPF) [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer				$ 0		0
Postemployment Benefits Liability				$ 1,500	$ 1,600
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation, Percentage, Plan Assets				99.00%
Postemployment Benefits, Period Expense				$ 200
Merchant Navy Ratings Pension Fund (MNRPF) [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer				0	100	$ 0
Postemployment Benefits Liability				$ 1,500	$ 1,600
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation, Percentage, Plan Assets				82.00%
Postemployment Benefits, Period Expense				$ 200