Note 16 - Significant Customers (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]

	Revenue									Accounts Receivable
	Year Ended December 31,									December 31,
Customer	2017			2016			2015			2017			2016
A (distributor)		17	%		22	%		24	%		16	%		19	%
B (distributor)		*			*			*			*			17	%
C (distributor)		10	%		*			*			*			*
D (value-added reseller)		*			*			*			15	%		*