Note 2 - Revenue (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three months ended September 30,				Nine months ended September 30,
(in thousands)	2020		2019		2020		2019
Revenue
United States	$	4,442	$	5,735	$	11,366	$	19,034
Europe and ROW		1,701		2,709		5,833		7,670
Asia		13,293		12,775		21,983		28,892
Total revenue	$	19,436	$	21,219	$	39,182	$	55,596