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Segment Reporting Net Sales and Operating Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenue, Net | $ 43,392 | $ 40,449 | $ 83,493 | $ 80,660
Operating Income (Loss) | (1,187) | (1,368) | (4,367) | (5,838)
Net interest and other expense | 173 | (302) | (362) | (557)
(Loss) income before income tax expense | (1,014) | (1,670) | (4,729) | (6,395)
Mobile Connectivity and Intertial Navigation Combined [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | 2,713 | 3,000 | 4,119 | 3,578
Other Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | (3,900) | (4,368) | (8,486) | (9,416)
Operating Segments [Member] | Mobile Connectivity [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue, Net | 33,764 | 34,034 | 66,513 | 68,321
Operating Income (Loss) | 1,149 | 2,638 | 2,221 | 3,260
Operating Segments [Member] | Intertial Navigation [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue, Net | 9,628 | 6,415 | 16,980 | 12,339
Operating Income (Loss) | $ 1,564 | $ 362 | $ 1,898 | $ 318

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