Note 1 - Description of Business and Summary of Significant Accounting Policies - Reclassification of Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenues	$ 85,585	$ 85,794
Analytics [Member]
Revenues	49,627	38,502
Integrated Yield Ramp [Member]
Revenues	$ 35,958	47,292
Previously Reported [Member]
Revenues		85,794
Previously Reported [Member] | Design-For-Inspection Solutions [Member]
Revenues		60,081
Previously Reported [Member] | Gainshare Performance Incentives [Member]
Revenues		25,713
Restatement Adjustment [Member]
Revenues
Restatement Adjustment [Member] | Design-For-Inspection Solutions [Member]
Revenues		(60,081)
Restatement Adjustment [Member] | Gainshare Performance Incentives [Member]
Revenues		(25,713)
Restatement Adjustment [Member] | Analytics [Member]
Revenues		38,502
Restatement Adjustment [Member] | Integrated Yield Ramp [Member]
Revenues		$ 47,292