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Note 7 - Stockholders' Equity - Option Summary (Details) - $ / shares
shares in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Number of shares outstanding (in shares) 11,845  
Number of shares outstanding, weighted average exercise price (in dollars per share) $ 14.44  
Number of shares outstanding, weighted average remaining contractual term (Year) 7 years 171 days 7 years 219 days
Number of shares granted (in shares) 416  
Number of shares granted, weighted average exercise price (in dollars per share) $ 13.65  
Number of shares exercised (in shares) (197)  
Number of shares exercised, weighted average exercise price (in dollars per share) $ 9.38  
Number of shares expired and forfeited (in shares) (215)  
Number of shares expired and forfeited, weighted average exercise price (in dollars per share) $ 19.73  
Number of shares outstanding (in shares) 11,849 11,845
Number of shares outstanding, weighted average exercise price (in dollars per share) $ 14.40 $ 14.44