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O. MAJOR CUSTOMERS - NARRATIVE (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sales Revenue, Segment [Member] | Five Customers [Member]      
Concentration risk 87.80% 81.80% 72.00%
Sales Revenue, Segment [Member] | Amazon [Member]      
Concentration risk 54.60% 52.50% 45.80%
Sales Revenue, Segment [Member] | Microsoft [Member]      
Concentration risk 18.30% 11.60%  
Sales Revenue, Segment [Member] | Cisco Systems, Inc. [Member]      
Concentration risk   10.40% 8.90%
Sales Revenue, Segment [Member] | Leading Internet Service Provider [Member]      
Concentration risk     6.70%
Sales Revenue, Segment [Member] | Arris [Member]      
Concentration risk 5.80%    
Accounts Receivable [Member] | Five Customers [Member]      
Concentration risk 88.30% 80.00%  
Accounts Receivable [Member] | Amazon [Member]      
Concentration risk 62.10% 51.40%  
Accounts Receivable [Member] | Wesco [Member]      
Concentration risk   14.40%  
Accounts Receivable [Member] | Arris [Member]      
Concentration risk 10.60%