Net Income Per Share: (Details) - USD ($)	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Numerator:
Net income	$ (2,563,812)	$ (3,531,973)	$ (364,091)	$ 593,742	$ (2,089,575)	$ 497,030	$ 784,217	$ 1,008,596	$ (5,866,134)	$ 200,268	$ 1,886,917
Denominator:
Basic weighted average shares									16,924,189	16,927,879	16,753,068
Dilutive effect of share-based awards (in shares)										221,227	102,786
Diluted weighted average shares									16,924,189	17,149,106	16,855,854
Net Income per common share:
Basic (in dollars per share)	$ (0.15)	$ (0.21)	$ (0.02)	$ 0.04	$ (0.12)	$ 0.03	$ 0.05	$ 0.06	$ (0.35)	$ 0.01	$ 0.11
Diluted (in dollars per share)	$ (0.15)	$ (0.21)	$ (0.02)	$ 0.03	$ (0.12)	$ 0.03	$ 0.05	$ 0.06	$ (0.35)	$ 0.01	$ 0.11
Options to purchase common stock outstanding (in shares)	645,168				687,168				645,168	687,168
Anti-dilutive options to purchase common stock excluded from the computation of diluted earnings per share (in shares)										55,666	445,472