Note 10 - Segment Reporting (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)		Mar. 31, 2022 USD ($)
Number of Operating Segments	5
Number of Reportable Segments	3
Depreciation, Depletion and Amortization	$ 5,415	[1]	$ 8,690	[2]
Electric Power Segment [Member]
Depreciation, Depletion and Amortization	3,988	[1]	6,975	[2]
Electric Power Segment [Member] | Cost of Sales [Member]
Depreciation, Depletion and Amortization	2,600		3,200
Telecommunications Segment [Member]
Depreciation, Depletion and Amortization	1,232	[1]	1,091	[2]
Telecommunications Segment [Member] | Cost of Sales [Member]
Depreciation, Depletion and Amortization	180		200
Renewables Segment [Member]
Depreciation, Depletion and Amortization	179	[1]	608	[2]
Renewables Segment [Member] | Cost of Sales [Member]
Depreciation, Depletion and Amortization	5,000
Other Segments [Member]
Depreciation, Depletion and Amortization	$ 16	[1]	16	[2]
Other Segments [Member] | Discontinued Operations, Held-for-Sale or Disposed of by Sale [Member]
Disposal Group, Including Discontinued Operation, Expenditures for Long-lived Assets			$ 10

[1] For the Electric Power segment, the Telecommunications segment, and the Renewables segment, depreciation and amortization includes $2.6 million, $0.18 million and $5 thousand respectively, which was included in cost of revenues in the Condensed Consolidated Statement of Operations.

[2] For the Electric Power segment and the Telecommunications segment, depreciation and amortization includes $3.2 million and $0.2 million respectively, which was included in cost of revenues in the Condensed Consolidated Statement of Operations.