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Note 4 - Summary of Stock Option Activity (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 5.17 $ 5.16    
Outstanding, Number of Shares (in shares) 68,400 72,400    
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 5.17 $ 5.17    
Outstanding, Number of Shares (in shares) 68,400 70,400    
Outstanding, Weighted Average Remaining Contractual Term 5 years 87 days 6 years 25 days    
Outstanding, Aggregate Intrinsic Value     $ 83,933 $ 86,886
Exercisable, Weighted Average Exercise Price (in dollars per share)     $ 5.17  
Exercisable, Number of Shares (in shares)     68,400 70,400
Exercisable, Weighted Average Remaining Contractual Term 5 years 87 days 6 years 25 days    
Exercisable, Aggregate Intrinsic Value     $ 83,933 $ 86,886
Exercised, Weighted Average Exercise Price (in dollars per share)   $ (4.96)    
Exercised, Number of Shares (in shares)   (2,000)    
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 5.17 $ 5.16 $ 5.17 $ 5.17