Intangible Assets (Details Textual) (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Intangible assets (Textual)
Amortization expeses of intangible assets	$ 1,443,812	$ 1,152,848	$ 1,215,797
Amortization expense for intangible assets in year 2013	1,534,000
Amortization expense for intangible assets in year 2014	1,239,000
Amortization expense for intangible assets in year 2015	1,122,000
Amortization expense for intangible assets in year 2016	959,000
Amortization expense for intangible assets in year 2017	$ 639,000