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The following tables present information about segment loss and income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 5,685	$ 4,051	$ 14,813	$ 14,138
Depreciation and amortization	98	114	329	360
Operating (loss) income	(518)	(451)	(2,370)	(3,383)
Operating Segments [Member] | T & D Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	2,996	1,507	7,980	7,370
Depreciation and amortization	15	28	50	95
Operating (loss) income	(100)	50	(664)	(1,353)
Operating Segments [Member] | T & D Solutions [Member] | Switchgear [Member]
Segment Reporting Information [Line Items]
Revenues	2,996	1,507	7,980	7,370
Operating Segments [Member] | Critical Power Segment [Member]
Segment Reporting Information [Line Items]
Revenues	2,689	2,544	6,833	6,768
Depreciation and amortization	76	78	257	240
Operating (loss) income	160	37	34	(363)
Operating Segments [Member] | Critical Power Segment [Member] | Equipment [Member]
Segment Reporting Information [Line Items]
Revenues	694	411	1,379	891
Operating Segments [Member] | Critical Power Segment [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenues	1,995	2,133	5,454	5,877
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	7	8	22	25
Operating (loss) income	$ (578)	$ (538)	$ (1,740)	$ (1,667)

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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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