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Note F - Significant Customers (Tables)
 6 Months Ended
Jun. 30, 2017
Customer Concentration Risk [Member]  
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
 
 
Three months ended June 30,
 
 
Six months ended June 30,
 
           
Unaudited
          
Major customers/ distributors
 
2017
 
 
2016
 
 
2017
 
 
2016
 
VTech Holdings Ltd.
    
29
 %    
29
 %    
30
 %    
30
 %
                                 
Tomen Electronics Corporation ¹ ²
    
9
 %    
12
 %    
10
 %    
10
 %
                                 
Ascend Technology Inc. ¹ ³
    
20
 %    
17
 %    
21
 %    
16
 %
                                 
Samsung Electronics Ltd.
    
2
 %    
13
 %    
1
 %    
13
 %