Note 7 - Concentration of Revenue (Tables)

6 Months Ended

Jun. 30, 2016

Notes Tables

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

	Three Months Ended June 30,						Six Months Ended June 30,
	2016			2015			2016			2015
Customer A		14.7	%		24.9	%		19.0	%		23.7	%
Customer B		15.5	%		15.4	%		12.4	%		19.0	%
Customer C		10.6	%		8.3	%		9.5	%		8.6	%
Customer D		14.9	%		--			14.8	%		--