Note 11 - Derivative Instruments - Impact from Derivatives on Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Gain (Loss) Recognized	$ 1,906	$ (664)	$ (1,880)
Interest Rate Swap [Member]
Net Gain (Loss) Recognized	1,906	(664)	(1,880)
Metal Swaps [Member]
Net Gain (Loss) Recognized	(1,903)	633	418
Embedded Customer Derivatives [Member]
Net Gain (Loss) Recognized	$ 1,903	$ (633)	$ (418)