Note 8 - Income Taxes (Details) - Income Tax Rate Reconciliation	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Rate Reconciliation [Abstract]
U.S. statutory federal tax rate	34.00%	34.00%	34.00%
State, net of federal benefit	0.30%
Research and development credits		(3.60%)	(0.50%)
Stock-based compensation	(13.70%)	0.10%	5.60%
Foreign income at lower rates	(33.80%)	(28.40%)	(31.80%)
Changes in valuation allowance	16.80%	7.00%	(6.10%)
Litigation reserves and other	1.00%	2.80%	1.90%
Effective tax rate	4.60%	11.90%	3.10%