Note 10 - Accrued Retirement Benefits - Net Periodic Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Interest cost	$ 0	$ 184	$ 252	$ 552
Expected return on plan assets	0	(174)	(216)	(522)
Amortization of net loss	0	68	321	204
Settlement expense	(587)	0	6,557	0
Pension and other postretirement expenses	$ (587)	$ 78	$ 6,914	$ 234