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Note 8 - Significant Customers / Concentration / Disaggregated Revenue (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
For the
t
hree months ended
 
   
March 31,
2020
   
March 31,
2019
 
Customer A
   
35
%    
13
%
Customer B
   
12
%    
20
%
Customer C
   
12
%    
*
 
Customer D
   
11
%    
*
 
Customer E
   
*
     
19
%
   
March 31,
2020
   
December
31,
2019
 
Customer A
   
40
%    
39
%
Customer C
   
16
%    
15
%
Customer B
   
11
%    
*
 
Customer E
    *       *