Note 2 - Summary of Significant Accounting Policies - Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accrued bonding	$ 1,920	$ 167
Accrued compensation	5,589	6,369
Working capital adjustment on Front Line Power Construction acquisition	4,592	14,092
Accrued interest	5,885	2,902
Accrued taxes payable	248	102
Accrued subcontractor expenses	11,299	0
Accrued union dues	937	870
Accrued vendor invoices and accrued other expenses	8,595	3,799
Total accrued expense	$ 39,065	$ 28,301