Note 17 - Geographic Information - Revenue Information by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues	$ 76,608	$ 46,084	$ 182,298	$ 142,214
UNITED STATES
Revenues	4,887	2,898	13,383	6,547
TAIWAN, PROVINCE OF CHINA
Revenues	45,821	28,390	105,196	74,519
CHINA
Revenues	$ 25,900	$ 14,796	$ 63,719	$ 61,148