Note 9 - Accrued Retirement Benefits - Net Periodic Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Pensions and other benefits:
Interest cost	$ 18	$ 105
Expected return on plan assets	0	(72)
Amortization of net loss	2	79
Settlement expense	0	6,807
Pension and other postretirement expenses	$ 20	$ 6,919