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ASC 606 and Business and Credit Concentrations Disaggregation of Revenue (Tables)
3 Months Ended
Mar. 31, 2018
Disaggregation of Contract Revenue with a Customer [Abstract]  
Disaggregation of Revenue [Table Text Block]
The following table summarizes net sales from contracts with customers for the three months ended March 31, 2018:

Mobile connectivity product, transfered at point in time
 
$
6,670

Mobile connectivity product, transfered over time
 
1,250

Mobile connectivity service
 
24,829

Inertial navigation product
 
6,072

Inertial navigation service
 
1,280

     Total net sales
 
$
40,101