Note 15 - Significant Customers (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

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

	Revenue									Accounts Receivable
	Year Ended December 31,									December 31,
Customer	2019			2018			2017			2019			2018
Company A (distributor)		23	%		22	%		17	%		24	%		25	%
Company B (distributor)		*			10	%		*			11	%		16	%
Company C (distributor)		*			*			10	%		*			*
Company A (value-added reseller)		*			*			*			13	%		*