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Note 11 - Significant Customers / Concentration (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
For the Year Ended December 31
,
 
   
2019
   
2018
 
Customer A
   
29
%    
*
 
Customer B
   
18
%    
10
%
Customer C
   
15
%    
*
 
   
December 31,
2019
   
December 31,
2018
 
Customer A
   
39
%    
58
%
Customer D
   
15
%    
*