Note 8 - Geographic Information and Major Customer Data - Revenues Based On Customer Location (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020		Mar. 31, 2019
Revenues	$ 23,615		$ 16,969
UNITED STATES
Revenues	3,295		1,779
Europe and Middle East [Member]
Revenues	5,103		3,342
Asia Pacific [Member]
Revenues	15,217		11,848
GERMANY
Revenues	3,964		2,589
CHINA
Revenues	12,074		7,243
KOREA, REPUBLIC OF
Revenues		[1]	1,767
JAPAN
Revenues		[1]	$ 2,647

[1] Less than 10%