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Note 4 - Accounts Receivable and Customer Concentrations (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Revenue
    
Accounts Receivable
  
   
20
20
    
201
9
    
20
20
    
201
9
  
Customer A
    
69
 %      
60
 %      
59
 %      
80
 %  
Customer B
    
2
 %      
11
 %      
10
 %      
11
 %  
Customer C
    
10
 %      
6
 %      
6
 %      
2
 %