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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill    
Balance, beginning $ 10,948 $ 10,948
No activity
Balance, ending 10,948 10,948
Accumulated impairment losses:    
Balance, beginning (2,421) (976)
Impairment charges   (1,445)
Balance, ending (2,421) (2,421)
Net Goodwill 8,527 8,527
T and D Segment [Member]    
Goodwill    
Balance, beginning 7,978 7,978
No activity  
Balance, ending 7,978 7,978
Accumulated impairment losses:    
Balance, beginning (2,421) (976)
Impairment charges   (1,445)
Balance, ending (2,421) (2,421)
Net Goodwill 5,557 5,557
Critical Power Segment [Member]    
Goodwill    
Balance, beginning 2,970 2,970
No activity
Balance, ending 2,970 2,970
Accumulated impairment losses:    
Balance, beginning  
Impairment charges
Balance, ending
Net Goodwill $ 2,970 $ 2,970