Segment Reporting (Details Textual)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Mobile Connectivity [Member] | Mobile Comm Product Sales [Member]
Segment Reporting Information [Line Items]
Percent of Consolidated Net Sales	25.00%	27.00%
Mobile Connectivity [Member] | VSAT Airtime Service Sales [Member]
Segment Reporting Information [Line Items]
Percent of Consolidated Net Sales	40.00%	38.00%
Mobile Connectivity [Member] | Training and Content Sales [Member]
Segment Reporting Information [Line Items]
Percent of Consolidated Net Sales	19.00%	22.00%
Intertial Navigation [Member] | FOG System Sales [Member]
Segment Reporting Information [Line Items]
Percent of Consolidated Net Sales	11.00%	10.00%
Non-US [Member]
Segment Reporting Information [Line Items]
Percent of consolidated long-lived tangible assets	10.00%	10.00%
Percent of Consolidated Net Sales	59.00%	63.00%