Note 8 - Geographic Information and Major Customer Data - Revenues Based On Customer Location (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues	$ 23,606	$ 18,400	$ 47,221	$ 35,369
UNITED STATES
Revenues	2,624	2,123	5,919	3,902
Europe and Middle East [Member]
Revenues	8,845	2,992	13,948	6,334
Asia Pacific [Member]
Revenues	12,137	13,285	27,354	25,133
GERMANY
Revenues	4,925	2,599	8,889	5,188
CHINA
Revenues	$ 9,554	9,306	$ 21,628	16,549
JAPAN
Revenues		$ 2,188		$ 4,835