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Note 16 - Significant Customers (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
 
 
Year Ended December 31,
 
Customer
 
2016
 
 
2015
 
 
2014
 
Distributor A
   
22
%    
24
%    
26
%
Schedule of Accounts Receivable by Major Customers by Reporting Segments [Table Text Block]
 
 
December 31,
 
Customer
 
2016
 
 
2015
 
Distributor A
   
19
%    
28
%
Distributor B
   
17
%    
17
%