Note 8 - Employee Retirement Plans - Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Projected and accumulated benefit obligation	$ 44,906	$ 48,048	$ 50,097	$ 64,273
Fair value of plan assets	$ 30,088	$ 30,255	$ 30,843	$ 45,378