Note 5 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
California R&D Tax Credits and California Net Operating Losses Related Acquisition of Syntricity [Member]
Deferred Tax Assets, Valuation Allowance	$ 6,300		$ 6,200
Increase (Decrease) in Income Taxes	2,500
Income Tax Expense (Benefit)	$ 1,025	$ 3,553
Effective Income Tax Rate Reconciliation, Percent	33.20%	37.30%
Unrecognized Tax Benefits	$ 11,000		11,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	6,600		$ 6,500
Unrecognized Tax Benefits In Long Term Liabilities	2,500
Unrecognized Tax Benefits In Deferred Tax Assets	9,000
Unrecognized Tax Benefits In Deferred Tax Asset Subject To Full Valuation Allowance	$ 4,500