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Segment Reporting Net Sales and Operating Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenue, Net | $ 43,517 | $ 40,450 | $ 127,010 | $ 121,110
Operating Income (Loss) | (920) | (1,801) | (5,287) | (7,639)
Net interest and other expense | (93) | (354) | (455) | (911)
(Loss) income before income tax expense | (1,013) | (2,155) | (5,742) | (8,550)
Mobile Connectivity and Intertial Navigation Combined [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | 3,363 | 2,416 | 7,482 | 5,994
Other Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | (4,283) | (4,217) | (12,769) | (13,633)
Operating Segments [Member] | Mobile Connectivity [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue, Net | 33,425 | 32,762 | 99,938 | 101,083
Operating Income (Loss) | 1,443 | 2,067 | 3,664 | 5,327
Operating Segments [Member] | Intertial Navigation [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue, Net | 10,092 | 7,688 | 27,072 | 20,027
Operating Income (Loss) | $ 1,920 | $ 349 | $ 3,818 | $ 667

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