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Note 10 - Significant Customers (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Year ended December 31,
 
   
2017
   
2016
   
2015
 
Customer A
   
16.1
%
   
16.3
%
   
14.2
%
Customer B
   
-
%*
   
-
%*
   
10.4
%
Total
   
16.1
%
   
16.3
%
   
24.6
%
 
As of December 31,
 
 
2017
 
2016
 
Customer A  
20.3
%  
13.4
%
Customer B
 
11.0
%
 
11.7
%
Total
 
31.3
%
 
25.1
%