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BUSINESS SEGMENT AND GEOGRAPHIC INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues
Revenues	$ 24,593	$ 27,284	$ 48,068	$ 52,340
Depreciation and Amortization	713	786	1,452	1,540
Operating Income	857	1,848	1,012	2,979
T And D Segment [Member]
Revenues
Transformers	21,599	23,367	42,531	44,650
Revenues	21,599	23,367	42,531	44,650
Depreciation and Amortization	323	345	667	681
Operating Income	1,696	2,886	3,144	4,935
Critical Power Segment [Member]
Revenues
Equipment	402	1,651	784	3,229
Service	2,592	2,266	4,753	4,461
Revenues	2,994	3,917	5,537	7,690
Depreciation and Amortization	374	423	753	822
Operating Income	(234)	(239)	(673)	(334)
Corporate [Member]
Revenues
Depreciation and Amortization	16	18	32	37
Operating Income	$ (605)	$ (799)	$ (1,459)	$ (1,622)

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- Definition

Amount before allowances and discounts of service revenue classified as transformers.

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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Aggregate revenue during the period from sale of goods in the normal course of business, before deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Amount before allowances and discounts of service revenue classified as other.

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-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
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