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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