XML 19 R36.htm IDEA: XBRL DOCUMENT v3.20.1
Note 16 - Concentration of Risk (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   
December 31,
 
   
2019
   
2018
 
                 
Accounts Receivable:
 
 
 
 
 
 
 
 
Customer A
   
18
%    
24
%
Customer B
   
 *
     
14
%
Customer C
   
10
%    
 *
 
                 
Net sales:
 
 
 
 
 
 
 
 
Customer A
   
20
%    
20
%
Customer B
   
12
%    
12
%