Note 7 - Accrued Retirement Benefits - Net Periodic Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Pensions and other benefits:
Interest cost	$ 337	$ 735
Expected return on plan assets	(216)	(695)
Amortization of net loss	235	273
Settlement expense	6,556	635
Pension and other postretirement expenses	6,912	948
Other changes in plan assets and benefits obligations recognized in comprehensive income:
Net loss (gain)	178	900
Amortization of recognized loss	(6,792)	(907)
Total recognized gain in comprehensive income	$ (6,614)	$ (7)