BUSINESS SEGMENT, GEOGRAPHIC AND CUSTOMER INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Revenues
Revenues	$ 101,390	$ 99,632
Depreciation and Amortization	2,704	2,800
Operating Income (Loss)	3,387	3,564
Assets	69,890	77,408
T And D Segment [Member]
Revenues
Transformers	86,325	81,000
Revenues	86,325	81,000
Depreciation and Amortization	1,103	1,328
Operating Income (Loss)	6,823	6,708
Assets	50,709	48,643
Critical Power Segment [Member]
Revenues
Equipment	5,898	10,166
Service	9,167	8,366
Revenues	15,065	18,532
Depreciation and Amortization	1,533	1,405
Operating Income (Loss)	(713)	62
Assets	7,955	10,620
Corporate [Member]
Revenues
Depreciation and Amortization	68	67
Operating Income (Loss)	(2,723)	(3,206)
Assets	4,282	7,009
Assets Of Discontinued Operations [Member]
Revenues
Assets	$ 6,944	$ 11,136

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

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Section S99
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- Definition

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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The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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- Definition

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)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

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

+ 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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