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Note 15 - Concentration of Risk (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Accounts receivable:
 
2015
 
 
2014
 
Customer A
    11%       *  
Customer B
    23%       17%  
Customer C
    8%       17%  
                 
                 
Net Sales:
 
 
 
 
 
 
 
 
Customer B
    18%       15%