BUSINESS SEGMENT AND GEOGRAPHIC INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues
Revenues	$ 30,897	$ 29,930	$ 58,159	$ 56,500
Depreciation and Amortization	733	753	1,453	1,494
Operating Income (Loss)	1,627	1,384	2,785	2,478
T And D Segment [Member]
Revenues
Transformers	23,366	22,118	44,650	40,495
Switchgear	3,614	2,720	5,819	6,607
Revenues	26,980	24,838	50,469	47,102
Depreciation and Amortization	364	396	714	753
Operating Income (Loss)	2,703	2,034	4,766	4,081
Critical Power Segment [Member]
Revenues
Equipment	1,651	3,321	3,229	5,858
Service	2,266	1,771	4,461	3,540
Revenues	3,917	5,092	7,690	9,398
Depreciation and Amortization	352	339	704	708
Operating Income (Loss)	(248)	44	(350)	(90)
Corporate [Member]
Revenues
Depreciation and Amortization	17	18	35	33
Operating Income (Loss)	$ (828)	$ (694)	$ (1,631)	$ (1,513)