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Note 8 - Computation of Income (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Restricted Stock [Member]            
Non-vested Restricted Stock Grants - Weighted Average Common Shares Outstanding (in shares) 1,073   21,093   33,366 20,992
Net Income $ 613,863 $ 653,000 $ 689,000 $ 289,000 $ 1,267,260 $ 978,000
Basic Income Per Share - Weighted Average Common Shares Outstanding (in shares) 3,957,012   3,872,073   3,956,609 3,871,960
Basic Income Per Share - Amount (in dollars per share) $ 0.16   $ 0.18   $ 0.32 $ 0.25
Diluted Income Per Share - Weighted Average Common Shares Outstanding (in shares) 3,958,085   3,893,166   3,989,975 3,892,952
Diluted Income Per Share - Amount (in dollars per share) $ 0.16   $ 0.18   $ 0.32 $ 0.25