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Note 15 - Concentration of Risk (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Accounts receivable:
 
2018
   
2017
 
Customer A
   
24
%    
26
%
Customer B
   
14
%    
*
 
                 
Net sales:
 
 
 
 
 
 
 
 
Customer A
   
20
%    
19
%
Customer B
   
12
%    
10
%