Note 4 - Property and Equipment, Net (Details Textual) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Depreciation and Amortization, Continuing Operations		$ 15,400	$ 5,000
Depreciation, Depletion and Amortization, Total	[1]	33,839	12,910
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		154	26
Disposed of Property, Plant and Equipment [Member]
Property, Plant and Equipment, Disposals		2,100	200
Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment		1,400	39
Proceeds From Disposal of Property, Plant and Equipment, Noncash		600	200
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		(49)	14
Telecommunications Segment [Member]
Depreciation, Depletion and Amortization, Total	[1]	4,863	2,326
Electric Power Segment [Member]
Depreciation, Depletion and Amortization, Total	[1]	26,911	5,969
Renewables Segment [Member]
Depreciation, Depletion and Amortization, Total	[1]	2,001	2,931
Cost of Sales [Member] | Telecommunications Segment [Member]
Depreciation, Depletion and Amortization, Total		600	400
Cost of Sales [Member] | Electric Power Segment [Member]
Depreciation, Depletion and Amortization, Total		13,200	4,000
Cost of Sales [Member] | Renewables Segment [Member]
Depreciation, Depletion and Amortization, Total		$ 27	$ 54

[1] For the year ended December 31, 2021, depreciation and amortization totals included $1.6 million that were classified in income from discontinued operations on the Consolidated Statements of Operations in the Other segment, with no such amounts in 2022. For the year ended December 31, 2022 depreciation and amortization totals included $0.6 million that was classified as cost of revenues in the Telecommunications segment, $13.2 million that was classified as cost of revenues in the Electric Power segment and $27 thousand that was classified as cost of revenue in the Renewables segment. For the year ended December 31, 2021 depreciation and amortization totals included $0.4 million that was classified as cost of revenues in the Telecommunications segment, $4.0 million that was classified as a cost of revenues in the Electric Power segment and $54 thousand that was classified as cost of revenue in the Renewables segment.