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Note 4 - Accounts Receivable and Customer Concentrations (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Revenue
   
Accounts Receivable
 
   
201
9
   
201
8
   
201
9
   
201
8
 
Customer A
   
60
%    
40
%    
80
%    
53
%
Customer B
   
11
%    
13.2
%    
11
%    
14
%