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Note 5 - Stockholders' Equity - Option Summary (Details) - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Balance at January 1, 2015 (in shares) 6,985,000 7,918,000
Balance at January 1, 2015 (in dollars per share) $ 8.73 $ 8.69
Balance at January 1, 2015 8 years 29 days 7 years 335 days
Granted (in shares) 125,000  
Granted (in dollars per share) $ 19.13  
Exercised (in shares) (713,000)  
Exercised (in dollars per share) $ 8.84  
Expired and forfeited (in shares) (345,000)  
Expired and forfeited (in dollars per share) $ 11.30