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Note 6 - Option Summary (Details) - $ / shares
shares in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 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 7 years 332 days 7 years 343 days
Number of shares granted (in shares) 1,080  
Number of shares granted, weighted average exercise price (in dollars per share) $ 20.76  
Number of shares exercised (in shares) (531)  
Number of shares exercised, weighted average exercise price (in dollars per share) $ 8.96  
Number of Shares expired and forfeited (in shares) (237)  
Number of Shares expired and forfeited, weighted average exercise price (in dollars per share) $ 24.81  
Number of shares outstanding (in shares) 8,747 8,435
Number of shares outstanding, weighted average exercise price (in dollars per share) $ 14.50 $ 13.64