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Note 4 - Accounts Receivable and Customer Concentrations
12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
4.
ACCOUNTS RECEIVABLE and customer concentrations
 
At
December 31, 2019
and
2018,
our allowance for doubtful accounts was
$0.
There were
no
charges against the allowance for doubtful accounts in
2019
or
2018.
 
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
 
   
201
9
   
201
8
   
201
9
   
201
8
 
Customer A
   
60
%    
40
%    
80
%    
53
%
Customer B
   
11
%    
13.2
%    
11
%    
14
%