Note 1 - Summary of Significant Accounting Policies - Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Accrued bonding	$ 1,962	$ 1,920
Accrued compensation	4,559	5,589
Working capital adjustment on Front Line Power Construction acquisition	4,592	4,592
Accrued interest payable	6,886	5,885
Accrued taxes payable	669	248
Accrued subcontractor expenses	16,274	11,299
Accrued union dues	874	937
Accrued vendor invoices and accrued other expenses	9,382	8,595
Total accrued expense	$ 45,198	$ 39,065