Summary of Nonqualified Stock Options Outstanding and Exercisable (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Outstanding Shares	89,700	106,050	245,956	345,600
Options Outstanding, Weighted Average Remaining Term	5 years
Options Outstanding Weighted Average Exercise Price	$ 17.27	$ 18.61	$ 13.90	$ 13.82
Options Outstanding Intrinsic Value	$ 1,603,494
Options Exercisable Shares	89,700
Option Exercisable Weighted Average Remaining Term	5 years
Options Exercisable Weighted Average Exercise Price	$ 17.27
Options Exercisable Intrinsic Value	1,603,494
Range One
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices Minimum	$ 6.76
Range of Exercise Prices Maximum	$ 9.99
Options Outstanding Shares	38,200
Options Outstanding, Weighted Average Remaining Term	4 years 2 months 12 days
Options Outstanding Weighted Average Exercise Price	$ 8.78
Options Outstanding Intrinsic Value	1,007,334
Options Exercisable Shares	38,200
Option Exercisable Weighted Average Remaining Term	4 years 2 months 12 days
Options Exercisable Weighted Average Exercise Price	$ 8.78
Options Exercisable Intrinsic Value	1,007,334
Range Two
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices Minimum	$ 10.00
Range of Exercise Prices Maximum	$ 26.98
Options Outstanding Shares	51,500
Options Outstanding, Weighted Average Remaining Term	5 years 7 months 6 days
Options Outstanding Weighted Average Exercise Price	$ 23.57
Options Outstanding Intrinsic Value	596,160
Options Exercisable Shares	51,500
Option Exercisable Weighted Average Remaining Term	5 years 7 months 6 days
Options Exercisable Weighted Average Exercise Price	$ 23.57
Options Exercisable Intrinsic Value	$ 596,160