Note 3 - STRATEGIC PARTNERSHIP AGREEMENT WITH ADVANTEST AND RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jul. 29, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Revenue from Contract with Customer, Including Assessed Tax		$ 27,419	$ 21,409	$ 51,619	$ 42,567
Strategic Partnership for Joint Development and Sales Technology Solutions [Member]
Stock Issued During Period, Shares, New Issues (in shares)	3,306,924
Proceeds from Issuance of Common Stock	$ 65,200
Amendment #1 to Software License & Related Services Agreement [Member]
Revenue from Contract with Customer, Including Assessed Tax		2,600		5,200
Related Party Transaction, Due from (to) Related Party, Total		100		100		$ 0
Contract with Customer, Liability, Total		$ 800		$ 800		$ 0