Note 13 - Supplemental Cash Flow Information - Supplemental Cash Flow (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest paid	$ 1,625	$ 118
Federal, state, and local income taxes paid, net	5,771	7
Change in contract receivables, net	3,153	3,492	$ 3,153	$ 3,492
Change in contract liabilities, net	(3,565)	(3,492)	$ (3,565)	$ (3,492)
Property, plant, and equipment purchases in accounts payable	855	462
Preliminary working capital true-up related to acquired business	$ 5,835	$ 0