Note 1 - Basis of Presentation and Summary of Significant Accounting Policies - Reclassification of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues	$ 21,158	$ 20,541
Analytics [Member]
Revenues	13,248	11,434
Integrated Yield Ramp [Member]
Revenues	$ 7,910	9,107
Previously Reported [Member]
Revenues		20,541
Previously Reported [Member] | Design-For-Inspection Solutions [Member]
Revenues		16,661
Previously Reported [Member] | Gainshare Performance Incentives [Member]
Revenues		3,880
Revision of Prior Period, Adjustment [Member]
Revenues
Revision of Prior Period, Adjustment [Member] | Design-For-Inspection Solutions [Member]
Revenues		(16,661)
Revision of Prior Period, Adjustment [Member] | Gainshare Performance Incentives [Member]
Revenues		(3,880)
Revision of Prior Period, Adjustment [Member] | Analytics [Member]
Revenues		11,434
Revision of Prior Period, Adjustment [Member] | Integrated Yield Ramp [Member]
Revenues		$ 9,107