Note 5 - Accounts Receivable and Customer Concentrations (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

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

	Revenue						Accounts Receivable
	2016			2015			2016			2015
Customer A		13.2	%		22.5	%		14.2	%		23.6	%
Customer B		28.5	%		2.0	%		52.2	%		28.9	%
Customer C		10.3	%		18.7	%		5.2	%		6.4	%
Customer D		3.6	%		3.9	%		3.2	%		11.6	%