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Note 11 - Stockholders' Equity - Stock Option Activity (Details) - $ / shares
shares in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Number of shares outstanding (in shares) 13,463  
Number of shares outstanding, weighted average exercise price (in dollars per share) $ 15.03  
Number of shares outstanding, weighted average remaining contractual term (Year) 7 years 182 days 8 years 3 days
Number of shares granted (in shares) 725  
Number of shares granted, weighted average exercise price (in dollars per share) $ 32.42  
Number of shares exercised (in shares) (1,332)  
Number of shares exercised, weighted average exercise price (in dollars per share) $ 11.84  
Expired and forfeited (in shares) (556)  
Number of shares expired and forfeited, weighted average exercise price (in dollars per share) $ 17.94  
Number of shares outstanding (in shares) 12,300 13,463
Number of shares outstanding, weighted average exercise price (in dollars per share) $ 16.27 $ 15.03