Note 11 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]

	Year Ended December 31,
	2014		2013			2012
United States	$	3,173	$	(2,309	)	$	807
International		33,219		26,316			17,083
Total income before income taxes	$	36,392	$	24,007		$	17,890

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Year Ended December 31,
	2014			2013			2012
Current:
Federal	$	18		$	77		$	840
State		(28	)		67			3
Foreign		943			1,053			1,302
Deferred:
Foreign		(36	)		(88	)		(11	)
Total income tax provision	$	897		$	1,109		$	2,134

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended December 31,
	2014			2013			2012
U.S. statutory federal tax rate		34.0	%		34.0	%		34.0	%
State, net of federal benefit		-			0.3			-
Research and development credits		(0.3	)		-			(3.6	)
Stock-based compensation		(9.3	)		(13.7	)		0.1
Foreign income at lower rates		(27.7	)		(33.8	)		(28.4	)
Changes in valuation allowance		6.2			16.8			7.0
Litigation reserves and other		(0.4	)		1.0			2.8
Effective tax rate		2.5	%		4.6	%		11.9	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	As of December 31,
	2014			2013
Deferred tax assets:
Research tax credits	$	10,393		$	8,303
Other expenses not currently deductible		4,861			3,204
Stock-based compensation		4,068			2,599
Litigation settlement		-			2,490
Net operating losses		298			627
Depreciation and amortization		181			291
Total deferred tax assets		19,801			17,514
Valuation allowance		(19,051	)		(16,739	)
Net deferred tax assets	$	750		$	775

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

Balance as at January 1, 2012	$	12,204
Gross increase for tax position of prior year		188
Gross increase for tax position of current year		689
Balance as of December 31, 2012		13,081
Gross increase for tax position of prior year		646
Gross increase for tax position of current year		1,528
Reduction for prior year tax position		(333	)
Balance as of December 31, 2013		14,922
Gross increase for tax position of prior year		584
Gross increase for tax position of current year		1,760
Reduction for prior year tax position		(860	)
Balance as of December 31, 2014	$	16,406