Pension and Other Post-retirement Benefit Plans (Details) (USD $)	9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Pension Benefits
Service cost	$ 246,496	$ 249,794
Interest cost	578,506	582,044
Expected return on plan assets	(583,646)	(557,278)
Amortization of prior service cost	12,314	12,604
Amortization of net (gain) loss	529,149	622,025
Net periodic benefit cost	782,819	909,189
Other Benefits
Service cost	10,791	10,364
Interest cost	31,177	31,440
Expected return on plan assets
Amortization of prior service cost	(8,768)	(8,768)
Amortization of net (gain) loss	(18,355)	(27,054)
Net periodic benefit cost	$ 14,845	$ 5,982