Note 16 - Significant Customers (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

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

	Revenue									Accounts Receivable
	Year Ended December 31,									December 31,
Customer	2018			2017			2016			2018			2017
A (distributor)		22	%		17	%		22	%		25	%		16	%
B (distributor)		10	%		*			*			16	%		*
C (distributor)		*			10	%		*			*			*
D (value-added reseller)		*			*			*			*			15	%