Note 9 - Segment Reporting (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)		Mar. 31, 2021 USD ($)
Number of Operating Segments	5
Number of Reportable Segments	3
Depreciation, Depletion and Amortization, Total	$ 8,690	[1]	$ 1,747	[2]
Electric Power Segment [Member]
Depreciation, Depletion and Amortization, Total	6,975	[1]	217	[2]
Electric Power Segment [Member] | Cost of Sales [Member]
Depreciation, Depletion and Amortization, Total	3,200
Telecommunications Segment [Member]
Depreciation, Depletion and Amortization, Total	1,091	[1]	0	[2]
Telecommunications Segment [Member] | Cost of Sales [Member]
Depreciation, Depletion and Amortization, Total	200
Other Segments [Member]
Depreciation, Depletion and Amortization, Total	16	[1]	441	[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		$ 705

[1] 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 Statements of Operations.

[2] For the Electric Power segment, depreciation and amortization includes $0.2 million, which was included in cost of revenues in the Condensed Consolidated Statements of Operations. Other category includes $432 thousand of depreciation and amortization from discontinued operations.