Note 8 - Contract Assets and Liabilities - Component of Contract Asset and Liability Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Costs in excess of billings and estimated earnings	$ 45,393	$ 14,158	$ 39,410
Contract retention	134,630	131,279	105,370
Total contract assets	180,023	145,437	144,780
Billings in excess of costs and estimated earnings, net of retention	142,065	169,542	126,850
Provisions for losses	23,293	30,499	26,783
Total contract liabilities	$ 165,358	$ 200,041	$ 153,633