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Note 5 - Accounts Receivable and Customer Concentrations (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Revenue
    
Accounts Receivable
  
   
2017
    
2016
    
2017
    
2016
  
Customer A
    
9.3
 %    
13.2
 %    
15.2
 %    
14.2
 %
Customer B
    
26.6
 %    
28.5
 %    
25.8
 %    
52.2
 %
Customer C
    
11.9
 %    
10.3
 %    
9.0
 %    
5.2
 %
Customer D
    
11.3
 %    
6.4
 %    
7.6
 %    
5.9
 %