Note 6 - Contract Assets and Liabilities - Component of Contract Asset and Liability Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	[1]
Costs in excess of billings and estimated earnings	$ 80,357	$ 14,158
Contract retention	161,559	131,279
Total contract assets	241,916	145,437
Billings in excess of costs and estimated earnings, net of retention	152,294	169,542
Provisions for losses	20,992	30,499
Total contract liabilities	$ 173,286	$ 200,041

[1] These balances do not include amounts held for sale (see Note 2).