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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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