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Note 7 - Concentration of Revenue (Tables)
3 Months Ended
Mar. 31, 2016
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
 
 
Three Months Ended March 31
,
 
 
 
201
6
 
 
2015
 
Customer A
    23.1 %     22.4 %
Customer B
    6.8 %     12.0 %
Customer C
    9.4 %     23.2 %
Customer D
    14.7 %     0.0 %