Summary of Stock Options Outstanding and Exercisable (Details) - USD ($)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Outstanding Shares	159,000	89,700	89,700	106,050
Options Outstanding, Weighted Average Remaining Term	5 years 8 months 12 days
Options Outstanding Weighted Average Exercise Price	$ 16.23	$ 17.27	$ 17.27	$ 18.61
Options Outstanding Intrinsic Value	$ 728,213
Options Exercisable Shares	89,700
Option Exercisable Weighted Average Remaining Term	3 years
Options Exercisable Weighted Average Exercise Price	$ 17.27
Options Exercisable Intrinsic Value	$ 408,740
Range One
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices Minimum	$ 8.78
Range of Exercise Prices Maximum	$ 8.78
Options Outstanding Shares	38,200
Options Outstanding, Weighted Average Remaining Term	2 years 2 months 12 days
Options Outstanding Weighted Average Exercise Price	$ 8.78
Options Outstanding Intrinsic Value	$ 408,740
Options Exercisable Shares	38,200
Option Exercisable Weighted Average Remaining Term	2 years 2 months 12 days
Options Exercisable Weighted Average Exercise Price	$ 8.78
Options Exercisable Intrinsic Value	$ 408,740
Range Two
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices Minimum	$ 14.87
Range of Exercise Prices Maximum	$ 14.87
Options Outstanding Shares	69,300
Options Outstanding, Weighted Average Remaining Term	9 years 1 month 6 days
Options Outstanding Weighted Average Exercise Price	$ 14.87
Options Outstanding Intrinsic Value	$ 319,473
Range Three
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices Minimum	$ 21.95
Range of Exercise Prices Maximum	$ 26.48
Options Outstanding Shares	51,500
Options Outstanding, Weighted Average Remaining Term	3 years 7 months 6 days
Options Outstanding Weighted Average Exercise Price	$ 23.57
Options Exercisable Shares	51,500
Option Exercisable Weighted Average Remaining Term	3 years 7 months 6 days
Options Exercisable Weighted Average Exercise Price	$ 23.57