Note 1 - The Company and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jan. 01, 2017	Dec. 31, 2016
Deferred Tax Assets, Valuation Allowance				$ 21,100
Payments Related to Tax Withholding for Share-based Compensation	$ 195
Accounting Standards Update 2016-09 [Member]
Deferred Tax Assets, Operating Loss Carryforwards			$ 6,900
Deferred Tax Assets, Valuation Allowance			$ 6,900