Note 11 - Derivative Instruments - Impact from Derivatives on Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fixed interest rate hedge	$ (664)	$ (1,880)	$ (1,520)
Interest Rate Swap [Member]
Fixed interest rate hedge	(664)	(1,880)	(1,520)
Metal Swaps [Member]
Fixed interest rate hedge	633	418	55
Embedded Customer Derivatives [Member]
Fixed interest rate hedge	$ (633)	$ (418)	$ (55)