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Note 4 - Stockholders' Equity (Details) - Stock Options Activity (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Stock Options Activity [Abstract]    
Outstanding - Number of Options 2,750 2,880
Outstanding - Weighted Average Exercise Price per Share $ 7.40 $ 7.35
Outstanding - Weighted Average Remaining Contractual Term 6 years 127 days  
Outstanding - Aggregate Intrinsic Value $ 29,694  
Vested and expected to vest, March 31, 2014 2,692  
Vested and expected to vest, March 31, 2014 $ 7.36  
Vested and expected to vest, March 31, 2014 6 years 113 days  
Vested and expected to vest, March 31, 2014 29,155  
Exercisable, March 31, 2014 1,858  
Exercisable, March 31, 2014 $ 6.87  
Exercisable, March 31, 2014 5 years 222 days  
Exercisable, March 31, 2014 $ 21,003  
Granted (weighted average fair value of $7.75 per share) 5  
Granted (weighted average fair value of $7.75 per share) $ 20.39  
Exercised (117)  
Exercised $ 6.68  
Canceled (11)  
Canceled $ 8.74  
Expired (7)  
Expired $ 5.91