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Note 4 - Accounts Receivable and Customer Concentrations
 12 Months Ended
Dec. 31, 2020
Notes to Financial Statements  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
4.
ACCOUNTS RECEIVABLE and customer concentrations
 
At
December 31, 2020
and
2019,
our allowance for doubtful accounts was
$0
.
There were
no
charges against the allowance for doubtful accounts in
2020
or
2019.
 
The following table indicates the percentage of consolidated revenue from continuing operations and year-end accounts receivable represented by each customer that represented more than
10
percent of consolidated revenue from continuing operations or year-end accounts receivable.
 
   
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
 %