Note 8 - Concentration of Revenue (Tables)

9 Months Ended

Sep. 30, 2018

Notes Tables

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Customer A		3.4%		15.4%		5.8%		10.1%
Customer B		3.8%		14.3%		4.5%		11.6%
Customer C		7.0%		13.1%		7.1%		11.8%
Customer D		17.0%		7.3%		17.4%		27.4%
Customer E		37.5%		−%		35.3%		−%