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Note 7 - Stockholders' Equity - Option Summary (Details) - $ / shares
shares in Thousands
 9 Months Ended 12 Months Ended
Sep. 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 6 years 313 days 7 years 343 days
Number of shares granted (in shares) 1,279  
Number of shares granted, weighted average exercise price (in dollars per share) $ 20.42  
Number of shares exercised (in shares) (653)  
Number of shares exercised, weighted average exercise price (in dollars per share) $ 8.76  
Number of Shares expired and forfeited (in shares) (544)  
Number of Shares expired and forfeited, weighted average exercise price (in dollars per share) $ 23.33  
Number of shares outstanding (in shares) 8,517 8,435
Number of shares outstanding, weighted average exercise price (in dollars per share) $ 14.42 $ 13.64