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Note F - Significant Customers (Tables)
 6 Months Ended
Jun. 30, 2018
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
  
2018
    
2017
    
2018
    
2017
  
VTech Holdings Ltd.
    
25
 %    
29
 %    
25
 %    
30
 %
Nexty Electronics ¹ ²
    
12
 %    
9
 %    
11
 %    
10
 %
Ascend Technology Inc. ¹ ³
    
25
 %    
20
 %    
26
 %    
21
 %