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Note 3 - Stock-based Compensation - Summary of Stock Option Activity (Details) - USD ($)
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 5.17 $ 5.78 $ 5.16 $ 5.04
Outstanding, Number of Shares (in shares) 72,400 84,600    
Exercised (in dollars per share) $ 4.96 $ 4.32    
Exercised (in shares) (2,000) (12,200)    
Outstanding, Number of Shares (in shares) 68,400 72,400    
Outstanding, Weighted Average Remaining Contractual Term 5 years 255 days 6 years 153 days    
Outstanding, Aggregate Intrinsic Value $ 83,933 $ 89,840    
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 5.17 $ 5.78    
Exercisable, Number of Shares (in shares) 68,400 72,400    
Exercisable, Weighted Average Remaining Contractual Term 5 years 255 days 6 years 153 days    
Exercisable, Aggregate Intrinsic Value $ 83,933 $ 89,840    
Cancelled (in dollars per share) $ (4.96)      
Cancelled (in shares) (2,000)      
Exercised, Weighted Average Exercise Price (in dollars per share) $ (4.96) $ (4.32)