Note 7 - Concentration of Revenue (Tables)

9 Months Ended

Sep. 30, 2016

Notes Tables

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Customer A		10.5	%		25.6	%		15.2	%		24.4	%
Customer B		8.0	%		20.9	%		10.4	%		19.7	%
Customer C		5.8	%		10.1	%		7.8	%		9.2	%
Customer D		43.4	%		0.0	%		27.8	%		0.6	%