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Net Income Per Share: (Details) (USD $)
3 Months Ended 12 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Numerator:                      
Net income $ 154,727 $ 307,473 $ 1,107,128 $ 317,589 $ 2,773,129 $ 259,971 $ 288,873 $ (342,979) $ 1,886,917 $ 2,978,994 $ 716,590
Denominator:                      
Basic weighted average shares                 16,753,068 16,641,895 16,782,223
Dilutive effect of share-based awards (in shares)                 102,786 5 42,398
Diluted weighted average shares                 16,855,854 16,641,900 16,824,621
Net income per common share:                      
Basic (in dollars per share) $ 0.01 $ 0.02 $ 0.07 $ 0.02 $ 0.17 $ 0.02 $ 0.02 $ (0.02) $ 0.11 $ 0.18 $ 0.04
Diluted (in dollars per share) $ 0.01 $ 0.02 $ 0.07 $ 0.02 $ 0.17 $ 0.02 $ 0.02 $ (0.02) $ 0.11 $ 0.18 $ 0.04
Options to purchase common stock outstanding (in shares) 824,834       836,200       824,834 836,200  
Anti-dilutive options to purchase common stock excluded from the computation of diluted earnings per share (in shares)                 445,472 806,200 184,300