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Note 5 - Stockholders' Equity - Option Summary (Details) - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Balance at January 1, 2015 (in shares) 6,960,000 7,918,000
Balance at January 1, 2015 (in dollars per share) $ 9.61 $ 8.69
Balance at January 1, 2015 7 years 328 days 7 years 335 days
Granted (in shares) 375,000  
Granted (in dollars per share) $ 29.26  
Exercised (in shares) (883,000)  
Exercised (in dollars per share) $ 8.97  
Expired and forfeited (in shares) (450,000)  
Expired and forfeited (in dollars per share) $ 11.02