Note 5 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
California R&D Tax Credits and California Net Operating Losses Related Acquisition of Syntricity [Member]
Deferred Tax Assets, Valuation Allowance	$ 6,400		$ 6,400		$ 6,200
Earliest Tax Year [Member] | State and Local Jurisdiction [Member]
Open Tax Year			2012
Latest Tax Year [Member] | State and Local Jurisdiction [Member]
Open Tax Year			2014
Increase (Decrease) in Income Taxes			$ (2,600)
Income Tax Expense (Benefit)	1,498	$ 1,572	$ 2,523	$ 5,125
Effective Income Tax Rate Reconciliation, Percent			37.10%	38.70%
Unrecognized Tax Benefits	11,300		$ 11,300		11,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	6,700		6,700		$ 6,500
Unrecognized Tax Benefits In Long Term Liabilities	2,600		2,600
Unrecognized Tax Benefits In Deferred Tax Assets	9,200		9,200
Unrecognized Tax Benefits In Deferred Tax Asset Subject To Full Valuation Allowance	$ 4,600		$ 4,600