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Segment Reporting (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Mobile Connectivity [Member] | Mobile Comm Product Sales [Member]
Segment Reporting Information [Line Items]
Percent of Consolidated Net Sales	22.00%	25.00%	23.00%	26.00%
Mobile Connectivity [Member] | VSAT Airtime Service Sales [Member]
Segment Reporting Information [Line Items]
Percent of Consolidated Net Sales	41.00%	35.00%	40.00%	35.00%
Mobile Connectivity [Member] | Training and Content Sales [Member]
Segment Reporting Information [Line Items]
Percent of Consolidated Net Sales	20.00%	19.00%	20.00%
Intertial Navigation [Member] | FOG System Sales [Member]
Segment Reporting Information [Line Items]
Percent of Consolidated Net Sales	12.00%	9.00%	11.00%	10.00%
Non-US [Member]
Segment Reporting Information [Line Items]
Percent of consolidated long-lived tangible assets	10.00%		10.00%		10.00%
Percent of Consolidated Net Sales	62.00%	63.00%	61.00%	63.00%
CANADA
Segment Reporting Information [Line Items]
Percent of Consolidated Net Sales		13.00%

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