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Note 6 - Option Summary (Details) - $ / shares
shares in Thousands
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Number of shares outstanding (in shares) 8,435  
Number of shares outstanding, weighted average exercise price (in dollars per share) $ 13.64  
Number of shares outstanding, weighted average remaining contractual term 8 years 21 days 7 years 343 days
Number of shares granted (in shares) 925  
Number of shares granted, weighted average exercise price (in dollars per share) $ 20.80  
Number of shares exercised (in shares) (243)  
Number of shares exercised, weighted average exercise price (in dollars per share) $ 10.41  
Number of Shares expired and forfeited (in shares) (156)  
Number of Shares expired and forfeited, weighted average exercise price (in dollars per share) $ 23.61  
Number of shares outstanding (in shares) 8,961 8,435
Number of shares outstanding, weighted average exercise price (in dollars per share) $ 14.30 $ 13.64