Note 4 - Revenue From Contracts With Customers - Revenues Disaggregated (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues from external customers	$ 99,822	$ 24,822	$ 263,989	$ 41,902
Time-and-Materials Contract [Member]
Revenues from external customers	8,672	4,940	33,394	7,757
Fixed-Price Contract [Member]
Revenues from external customers	51,345	8,424	126,860	13,437
Unit Price Contract [Member]
Revenues from external customers	39,805	11,458	103,735	20,708
Electric Power Segment [Member]
Revenues from external customers	36,732	12,200	117,695	20,297
Electric Power Segment [Member] \| Time-and-Materials Contract [Member]
Revenues from external customers	8,672	4,940	33,282	7,757
Electric Power Segment [Member] \| Fixed-Price Contract [Member]
Revenues from external customers	10,768	2,385	34,661	3,614
Electric Power Segment [Member] \| Unit Price Contract [Member]
Revenues from external customers	17,292	4,875	49,752	8,926
Telecommunications Segment [Member]
Revenues from external customers	24,064	8,742	60,524	14,816
Telecommunications Segment [Member] \| Time-and-Materials Contract [Member]
Revenues from external customers	0	0	112	0
Telecommunications Segment [Member] \| Fixed-Price Contract [Member]
Revenues from external customers	1,551	2,159	6,429	3,034
Telecommunications Segment [Member] \| Unit Price Contract [Member]
Revenues from external customers	22,513	6,583	53,983	11,782
Renewables Segment [Member]
Revenues from external customers	39,026	3,880	85,770	6,789
Renewables Segment [Member] \| Time-and-Materials Contract [Member]
Revenues from external customers	0	0	0	0
Renewables Segment [Member] \| Fixed-Price Contract [Member]
Revenues from external customers	39,026	3,880	85,770	6,789
Renewables Segment [Member] \| Unit Price Contract [Member]
Revenues from external customers	0	0	0	0
Public Utilities [Member]
Revenues from external customers	35,208	12,200	114,495	20,297
Public Utilities [Member] \| Electric Power Segment [Member]
Revenues from external customers	35,076	12,200	114,363	20,297
Public Utilities [Member] \| Telecommunications Segment [Member]
Revenues from external customers	132	0	132	0
Public Utilities [Member] \| Renewables Segment [Member]
Revenues from external customers	0	0	0	0
Telecommunications [Member]
Revenues from external customers	24,464	8,742	61,833	14,816
Telecommunications [Member] \| Electric Power Segment [Member]
Revenues from external customers	532	0	1,441	0
Telecommunications [Member] \| Telecommunications Segment [Member]
Revenues from external customers	23,932	8,742	60,392	14,816
Telecommunications [Member] \| Renewables Segment [Member]
Revenues from external customers	0	0	0	0
Renewables [Member]
Revenues from external customers	39,026	3,880	85,770	6,789
Renewables [Member] \| Electric Power Segment [Member]
Revenues from external customers	0	0	0	0
Renewables [Member] \| Telecommunications Segment [Member]
Revenues from external customers	0	0	0	0
Renewables [Member] \| Renewables Segment [Member]
Revenues from external customers	39,026	3,880	85,770	6,789
Product and Service, Other [Member]
Revenues from external customers	1,124	0	1,891	0
Product and Service, Other [Member] \| Electric Power Segment [Member]
Revenues from external customers	1,124	0	1,891	0
Product and Service, Other [Member] \| Telecommunications Segment [Member]
Revenues from external customers	0	0	0	0
Product and Service, Other [Member] \| Renewables Segment [Member]
Revenues from external customers	$ 0	$ 0	$ 0	$ 0