Note 14 - Supplemental Cash Flow Information - Supplemental Cash Flow (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Interest paid	$ 4,244	$ 4,566
Federal, state, and local income taxes paid, net	3,889	4,047
Change in contract receivables, net	(2,990)	1,062
Change in contract liabilities, net	2,990	(1,062)
Property, plant, and equipment purchases in accounts payable	$ 1,114	$ 2,073