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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 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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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