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GOODWILL AND OTHER INTANGIBLE ASSETS (Details 1) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Intangible assets, balance $ 4,922  
Amortization (383) $ (414)
Intangible assets, balance 4,569  
Total Intangible [Member]    
Intangible assets, balance 4,922  
Amortization (353)  
Intangible assets, balance 4,569  
T And D Segment [Member]    
Intangible assets, balance 3,677  
Amortization (73)  
Intangible assets, balance 3,604  
Critical Power Segment [Member]    
Intangible assets, balance 1,245  
Amortization (280)  
Intangible assets, balance $ 965