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B. Summary Of Significant Accounting Policies (Details Narrative) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash and cash equivalents $ 28,074 $ 32,175 $ 22,006 $ 10,723
Cash in excess of FDIC insurance 23,300      
Accrued warranty $ 412 247    
Land use rights expiration date October 7, 2054      
Advertising Costs $ 104 $ 100 $ 121  
Sales Revenue, Net [Member] | Five Customers [Member]        
Concentration of credit risk 81.80% 72.00% 59.10%  
Sales Revenue, Net [Member] | Amazon [Member]        
Concentration of credit risk 52.50%      
Sales Revenue, Net [Member] | Microsoft [Member]        
Concentration of credit risk 11.60%      
Sales Revenue, Net [Member] | Cisco [Member]        
Concentration of credit risk 10.40%      
Accounts Receivable [Member] | Five Customers [Member]        
Concentration of credit risk 80.00% 70.00%    
Accounts Receivable [Member] | Amazon [Member]        
Concentration of credit risk 51.40%      
Accounts Receivable [Member] | Wesco [Member]        
Concentration of credit risk 14.40%      
Foreign Accounts [Member]        
Cash and cash equivalents $ 8,900 $ 4,600    
TAIWAN, PROVINCE OF CHINA        
Restricted cash 4,700 $ 500    
Certificates of deposit 7,900      
Pledged certificate of deposit for line of credit $ 7,900