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BUSINESS SEGMENT AND GEOGRAPHIC INFORMATION (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenues    
Revenues $ 24,699 $ 27,177
Depreciation and Amortization 472 828
Operating Income 592 281
Critical Power Segment [Member]    
Revenues    
Equipment 173 382
Service 1,771 2,161
Revenues 1,944 2,543
Depreciation and Amortization 36 378
Operating Income (402) (438)
T And D Segment [Member]    
Revenues    
Transformers 21,682 20,932
Switchgear 1,073 3,702
Revenues 22,755 24,634
Depreciation and Amortization 422 434
Operating Income 1,804 1,573
Unallocated Corporate Overhead Expenses [Member]    
Revenues    
Depreciation and Amortization 14 16
Operating Income $ (810) $ (854)