Note 10 - Employee Benefit Plans - Components of Net Periodic Pension Cost and Assumed Discount Rate (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Service cost	$ 0	$ 0
Interest cost	104	82
Amortization of prior service cost	0	0
Amortization of losses	9	33
Net periodic cost	$ 113	$ 115