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Schedule of information about segment income and loss and segment assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]    
Revenues $ 18,311 $ 19,490
Depreciation and Amortization 438 464
Operating Loss (3,862) (4,284)
Assets 27,927 21,287
Operating Segments [Member] | T & D Solutions [Member]    
Segment Reporting Information [Line Items]    
Revenues 9,484 10,257
Depreciation and Amortization 61 113
Operating Loss (1,060) (1,934)
Assets 6,490 3,443
Operating Segments [Member] | T & D Solutions [Member] | Switchgear [Member]    
Segment Reporting Information [Line Items]    
Revenues 9,484 10,257
Operating Segments [Member] | Critical Power Segment [Member]    
Segment Reporting Information [Line Items]    
Revenues 8,827 9,233
Depreciation and Amortization 349 319
Operating Loss (385) (430)
Assets 3,573 3,705
Operating Segments [Member] | Critical Power Segment [Member] | Equipment [Member]    
Segment Reporting Information [Line Items]    
Revenues 1,891 1,574
Operating Segments [Member] | Critical Power Segment [Member] | Service [Member]    
Segment Reporting Information [Line Items]    
Revenues 6,936 7,659
Corporate, Non-Segment [Member]    
Segment Reporting Information [Line Items]    
Depreciation and Amortization 28 32
Operating Loss (2,417) (1,920)
Assets $ 17,864 $ 14,139