The following tables present information about segment income and loss: (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 5,625	$ 5,087	$ 9,127	$ 10,088
Depreciation and Amortization	87	125	230	248
Operating Loss	(745)	(1,184)	(1,852)	(2,932)
Operating Segments [Member] \| T & D Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	3,596	2,987	4,983	5,864
Depreciation and Amortization	18	33	35	68
Operating Loss	(125)	(626)	(564)	(1,403)
Operating Segments [Member] \| T & D Solutions [Member] \| Switchgear [Member]
Segment Reporting Information [Line Items]
Revenues	3,596	2,987	4,983	5,864
Operating Segments [Member] \| Critical Power Segment [Member]
Segment Reporting Information [Line Items]
Revenues	2,029	2,100	4,144	4,224
Depreciation and Amortization	62	84	181	163
Operating Loss	(42)	(199)	(126)	(399)
Operating Segments [Member] \| Critical Power Segment [Member] \| Equipment [Member]
Segment Reporting Information [Line Items]
Revenues	159	225	685	480
Operating Segments [Member] \| Critical Power Segment [Member] \| Service [Member]
Segment Reporting Information [Line Items]
Revenues	1,870	1,875	3,459	3,744
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization	7	8	14	17
Operating Loss	$ (578)	$ (359)	$ (1,162)	$ (1,130)

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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