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BUSINESS SEGMENT AND GEOGRAPHIC INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues
Revenues	$ 25,956	$ 25,494	$ 74,024	$ 77,835
Depreciation and Amortization	699	943	2,152	2,482
Operating Income	1,949	1,055	2,962	4,036
T And D Segment [Member]
Revenues
Transformers	22,663	21,547	65,194	66,198
Revenues	22,663	21,547	65,194	66,198
Depreciation and Amortization	314	348	981	1,028
Operating Income	2,449	1,777	5,594	6,715
Critical Power Segment [Member]
Revenues
Equipment	388	1,261	1,171	4,490
Service	2,905	2,686	7,659	7,147
Revenues	3,293	3,947	8,830	11,637
Depreciation and Amortization	369	577	1,122	1,399
Operating Income	141	83	(533)	(252)
Unallocated Corporate Overhead Expenses [Member]
Revenues
Depreciation and Amortization	16	18	49	55
Operating Income	$ (641)	$ (805)	$ (2,099)	$ (2,427)

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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
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-Section 45
-Paragraph 28
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
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-Name Accounting Standards Codification
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