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The following tables present information about segment income (loss): (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Revenues	$ 6,251	$ 4,863	$ 6,362	$ 5,685	$ 11,225	$ 17,476	$ 14,813
Depreciation and amortization	94			98		290	329
Operating income (loss)	(1,444)			(518)		(4,789)	(2,370)
Operating Segments [Member] | T & D Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	3,773			2,996		10,039	7,980
Depreciation and amortization	14			15		35	50
Operating income (loss)	171			(100)		(183)	(664)
Operating Segments [Member] | T & D Solutions [Member] | Power Systems [Member]
Segment Reporting Information [Line Items]
Revenues	3,773			2,996		10,029	7,980
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	2,478			2,689		7,437	6,833
Depreciation and amortization	73			76		234	257
Operating income (loss)	(765)			160		(1,676)	34
Operating Segments [Member] | Critical Power Segment [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenues	2,053			1,995		5,434	5,454
Operating Segments [Member] | Critical Power Segment [Member] | Equipment [Member]
Segment Reporting Information [Line Items]
Revenues	425			694		2,003	1,379
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	7			7		21	22
Operating income (loss)	$ (850)			$ (578)		$ (2,930)	$ (1,740)

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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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