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The following tables present information about segment loss: (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Revenues	$ 4,289	$ 5,625	$ 10,325	$ 9,127
Depreciation and amortization	110	87	197	230
Operating income (loss)	(2,504)	(745)	(3,375)	(1,852)
Operating Segments [Member] | T & D Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	1,969	3,596	5,366	4,983
Depreciation and amortization	11	18	21	35
Operating income (loss)	(424)	(125)	(383)	(564)
Operating Segments [Member] | T & D Solutions [Member] | Power Systems [Member]
Segment Reporting Information [Line Items]
Revenues	1,969	3,596	5,356	4,983
Operating Segments [Member] | T & D Solutions [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenues			10
Operating Segments [Member] | Critical Power Segment [Member]
Segment Reporting Information [Line Items]
Revenues	2,320	2,029	4,959	4,144
Depreciation and amortization	92	62	162	181
Operating income (loss)	(757)	(42)	(911)	(126)
Operating Segments [Member] | Critical Power Segment [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenues	1,857	1,870	3,381	3,459
Operating Segments [Member] | Critical Power Segment [Member] | Equipment [Member]
Segment Reporting Information [Line Items]
Revenues	463	159	1,578	685
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	7	7	14	14
Operating income (loss)	$ (1,323)	$ (578)	$ (2,081)	$ (1,162)

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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