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Note 5 - Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Finite-lived intangible asset, gross   $ 122,069 $ 130,160
Finite-lived intangible asset, accumulated amortization   (24,360) (10,240)
Impairment of Intangible Assets, Finite-Lived   (4,323)  
Finite-lived intangible asset, net   97,709 119,920
Indefinite-lived Intangible Assets, gross   22,736 22,736
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill) $ 0 (9,311)  
Indefinite-lived Intangible Assets   13,425 22,736
Total identifiable other intangible assets   144,805 152,896
Impairment of Intangible Assets   (13,634)  
Other intangibles assets, net   111,134 142,656
Electric Power Segment [Member]      
Finite-lived intangible asset, gross   93,198 93,198
Finite-lived intangible asset, accumulated amortization   (15,487) (1,848)
Impairment of Intangible Assets, Finite-Lived   0  
Finite-lived intangible asset, net   77,711 91,350
Indefinite-lived Intangible Assets, gross   15,027 15,027
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)   (7,383)  
Trade name - Front Line   7,644 15,027
Other intangibles assets, net   85,355 106,377
Telecommunications Segment [Member]      
Finite-lived intangible asset, gross   23,055 22,476
Finite-lived intangible asset, accumulated amortization   (4,502) (1,614)
Impairment of Intangible Assets, Finite-Lived   0  
Finite-lived intangible asset, net   18,553 20,862
Indefinite-lived Intangible Assets, gross   7,709 7,709
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)   (1,928)  
Indefinite-lived Intangible Assets   5,781 7,709
Other intangibles assets, net   24,333 28,571
Telecommunications Segment [Member] | Trade Name, GTS [Member]      
Indefinite-lived Intangible Assets, gross   6,388 6,388
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)   (1,746)  
Indefinite-lived Intangible Assets   4,642 6,388
Telecommunications Segment [Member] | Trade Name - IMMCO [Member]      
Indefinite-lived Intangible Assets, gross   1,162 1,162
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)   (182)  
Indefinite-lived Intangible Assets   980 1,162
Telecommunications Segment [Member] | Trade Name - Full Moon [Member]      
Indefinite-lived Intangible Assets, gross   159 159
Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill)   0  
Indefinite-lived Intangible Assets   159 159
Renewables Segment [Member]      
Finite-lived intangible asset, gross   5,090 13,737
Finite-lived intangible asset, accumulated amortization   (3,645) (6,029)
Impairment of Intangible Assets, Finite-Lived   (4,323)  
Finite-lived intangible asset, net   1,445 7,708
Other intangibles assets, net   1,446 7,708
Other Segments [Member]      
Finite-lived intangible asset, gross   726 749
Finite-lived intangible asset, accumulated amortization   (726) (749)
Impairment of Intangible Assets, Finite-Lived   0  
Finite-lived intangible asset, net   0 0
Other intangibles assets, net   $ 0 0
Order or Production Backlog [Member]      
Finite-lived intangible asset, useful life (Year)   1 year  
Order or Production Backlog [Member] | Electric Power Segment [Member]      
Finite-lived intangible asset, useful life (Year)   1 year  
Finite-lived intangible asset, gross   $ 9,186 9,186
Finite-lived intangible asset, accumulated amortization   (9,186) (1,148)
Impairment of Intangible Assets, Finite-Lived   0  
Finite-lived intangible asset, net   $ 0 8,038
Customer Relationships - Front Line Power Construction [Member]      
Finite-lived intangible asset, useful life (Year)   15 years  
Customer Relationships - Front Line Power Construction [Member] | Electric Power Segment [Member]      
Finite-lived intangible asset, useful life (Year)   15 years  
Finite-lived intangible asset, gross   $ 84,012 84,012
Finite-lived intangible asset, accumulated amortization   (6,301) (700)
Impairment of Intangible Assets, Finite-Lived   0  
Finite-lived intangible asset, net   $ 77,711 83,312
Customer Relationships - Front Line Power Construction [Member] | Electric Power Segment [Member] | Weighted Average [Member]      
Remaining amortization period (Year)   13 years 10 months 20 days  
Customer Relationships - Gibson Technical Services [Member]      
Finite-lived intangible asset, useful life (Year)   10 years  
Customer Relationships - Gibson Technical Services [Member] | Telecommunications Segment [Member]      
Finite-lived intangible asset, useful life (Year)   10 years  
Finite-lived intangible asset, gross   $ 16,075 16,075
Finite-lived intangible asset, accumulated amortization   (2,760) (1,152)
Impairment of Intangible Assets, Finite-Lived   0  
Finite-lived intangible asset, net   $ 13,315 14,923
Customer Relationships - Gibson Technical Services [Member] | Telecommunications Segment [Member] | Weighted Average [Member]      
Remaining amortization period (Year)   8 years 3 months 14 days  
Customer Relationships - IMMCO [Member]      
Finite-lived intangible asset, useful life (Year)   10 years  
Customer Relationships - IMMCO [Member] | Telecommunications Segment [Member]      
Finite-lived intangible asset, useful life (Year)   10 years  
Finite-lived intangible asset, gross   $ 3,800 3,800
Finite-lived intangible asset, accumulated amortization   (547) (158)
Impairment of Intangible Assets, Finite-Lived   0  
Finite-lived intangible asset, net   $ 3,253 3,642
Customer Relationships - IMMCO [Member] | Telecommunications Segment [Member] | Weighted Average [Member]      
Remaining amortization period (Year)   8 years 6 months 29 days  
Customer Relationships - Full Moon [Member] | Telecommunications Segment [Member]      
Finite-lived intangible asset, useful life (Year)   10 years  
Finite-lived intangible asset, gross   $ 210 210
Finite-lived intangible asset, accumulated amortization   (25) (4)
Impairment of Intangible Assets, Finite-Lived   0  
Finite-lived intangible asset, net   $ 185 206
Customer Relationships - Full Moon [Member] | Telecommunications Segment [Member] | Weighted Average [Member]      
Remaining amortization period (Year)   8 years 9 months 25 days  
Technology - Know How [Member]      
Finite-lived intangible asset, useful life (Year)   3 years  
Finite-lived intangible asset, net   $ 940  
Technology - Know How [Member] | Telecommunications Segment [Member]      
Finite-lived intangible asset, useful life (Year)   4 years  
Finite-lived intangible asset, gross   $ 1,459 1,459
Finite-lived intangible asset, accumulated amortization   (519) (152)
Impairment of Intangible Assets, Finite-Lived   0  
Finite-lived intangible asset, net   $ 940 1,307
Technology - Know How [Member] | Telecommunications Segment [Member] | Weighted Average [Member]      
Remaining amortization period (Year)   2 years 6 months 29 days  
Software - IMMCO [Member] | Telecommunications Segment [Member]      
Finite-lived intangible asset, useful life (Year)   3 years  
Finite-lived intangible asset, gross   $ 1,126 547
Finite-lived intangible asset, accumulated amortization   (519) (93)
Impairment of Intangible Assets, Finite-Lived   0  
Finite-lived intangible asset, net   $ 607 454
Software - IMMCO [Member] | Telecommunications Segment [Member] | Weighted Average [Member]      
Remaining amortization period (Year)   1 year 2 months 23 days  
Non-compete Agreements -GTS [Member]      
Finite-lived intangible asset, useful life (Year)   5 years  
Non-compete Agreements -GTS [Member] | Telecommunications Segment [Member]      
Finite-lived intangible asset, useful life (Year)   5 years  
Finite-lived intangible asset, gross   $ 385 385
Finite-lived intangible asset, accumulated amortization   (132) (55)
Impairment of Intangible Assets, Finite-Lived   0  
Finite-lived intangible asset, net   $ 253 330
Non-compete Agreements -GTS [Member] | Telecommunications Segment [Member] | Weighted Average [Member]      
Remaining amortization period (Year)   3 years 3 months 14 days  
Customer Relationships [Member]      
Impairment of Intangible Assets, Finite-Lived $ (4,300)    
Finite-lived intangible asset, net   $ 94,464  
Customer Relationships [Member] | Renewables Segment [Member]      
Finite-lived intangible asset, useful life (Year)   5 years  
Finite-lived intangible asset, gross   $ 0 8,647
Finite-lived intangible asset, accumulated amortization   0 (3,027)
Impairment of Intangible Assets, Finite-Lived   (4,323)  
Finite-lived intangible asset, net   $ 0 5,620
Trade Names [Member] | Renewables Segment [Member]      
Finite-lived intangible asset, useful life (Year)   1 year  
Finite-lived intangible asset, gross   $ 1,878 1,878
Finite-lived intangible asset, accumulated amortization   (1,878) (1,878)
Impairment of Intangible Assets, Finite-Lived   0  
Finite-lived intangible asset, net   0 0
Noncompete Agreements [Member]      
Finite-lived intangible asset, net   $ 1,698  
Noncompete Agreements [Member] | Renewables Segment [Member]      
Finite-lived intangible asset, useful life (Year)   5 years  
Finite-lived intangible asset, gross   $ 3,212 3,212
Finite-lived intangible asset, accumulated amortization   (1,767) (1,124)
Impairment of Intangible Assets, Finite-Lived   0  
Finite-lived intangible asset, net   $ 1,445 2,088
Noncompete Agreements [Member] | Renewables Segment [Member] | Weighted Average [Member]      
Remaining amortization period (Year)   2 years 3 months  
Computer Software, Intangible Asset [Member]      
Finite-lived intangible asset, net   $ 607  
Computer Software, Intangible Asset [Member] | Other Segments [Member]      
Finite-lived intangible asset, useful life (Year)   3 years  
Finite-lived intangible asset, gross   $ 726 713
Finite-lived intangible asset, accumulated amortization   (726) (713)
Impairment of Intangible Assets, Finite-Lived   0  
Finite-lived intangible asset, net   $ 0 0
Product Certification [Member] | Other Segments [Member]      
Finite-lived intangible asset, useful life (Year)   3 years  
Finite-lived intangible asset, gross   $ 0 36
Finite-lived intangible asset, accumulated amortization   0 (36)
Impairment of Intangible Assets, Finite-Lived   0  
Finite-lived intangible asset, net   $ 0 $ 0