BUSINESS SEGMENT AND GEOGRAPHIC INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Revenues	$ 29,794	$ 29,389	$ 87,953	$ 85,889
Depreciation and Amortization	890	822	2,344	2,317
Operating Income (Loss)	599	1,212	3,383	3,690
T And D Segment [Member]
Revenues
Transformers	21,548	21,110	66,198	61,605
Switchgear	4,299	4,268	10,118	10,876
Revenues	25,847	25,378	76,316	72,481
Depreciation and Amortization	366	450	1,082	1,203
Operating Income (Loss)	1,442	2,002	6,207	6,083
Critical Power Segment [Member]
Revenues
Equipment	1,261	1,741	4,490	7,598
Service	2,686	2,270	7,147	5,810
Revenues	3,947	4,011	11,637	13,408
Depreciation and Amortization	507	355	1,210	1,063
Operating Income (Loss)	72	(10)	(277)	(100)
Corporate [Member]
Revenues
Depreciation and Amortization	17	17	52	51
Operating Income (Loss)	$ (915)	$ (780)	$ (2,547)	$ (2,293)