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Note 15 - Concentration of Risk (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Accounts receivable:
 
2017
   
2016
 
Customer A
   
*
     
11%
 
Customer B
   
26%
     
15%
 
Customer C
   
*
     
21%
 
                 
Net Sales:
 
 
 
 
 
 
 
 
Customer B
   
19%
     
17%
 
Customer C
   
10%
     
11%