Note 8 - Contract Assets and Liabilities - Component of Contract Asset and Liability Balances (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Costs in excess of billings and estimated earnings	$ 47,184	$ 14,158	$ 46,771
Contract retention	143,003	131,279	107,771
Total contract assets	190,187	145,437	154,542
Billings in excess of costs and estimated earnings, net of retention	159,541	169,542	139,327
Provisions for losses	19,781	30,499	27,088
Total contract liabilities	$ 179,322	$ 200,041	$ 166,415