Note 9 - Income Taxes (Details) - Components of Company's Net Deferred Taxes (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets
Net operating loss carry forwards	$ 8,314	$ 8,532
Research and development credits	30,637	15,460
Stock-based compensation	6,966	5,192
Accrued expenses and allowances	2,117	1,592
Amortization and depreciation	1,052
Other temporary differences	3,461	111
Valuation allowance	(39,682)	(22,448)
Total deferred tax assets	12,865	8,439
Deferred tax liabilities
Subpart F income on foreign subsidiaries earnings	(5,981)	(5,621)
Acquired intangible assets	(6,157)
Amortization and depreciation		(2,790)
Other deferred tax liabilities	(820)
Total deferred tax liabilities	(12,958)	(8,411)
Deferred tax assets (liabilities), net	$ (93)	$ 28