Pension and Other Post-retirement Benefit Plans (Details1) (USD $)	12 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Prepaid (accrued) benefit liability - Net amount recognized at end of period	$ (7,680,065)	$ (6,622,459)
Pension Benefits
Service cost	328,661	333,060	333,425
Interest cost	771,341	776,058	797,680
Expected return on plan assets	(778,194)	(743,037)	(692,297)
Amortization of prior service cost	16,418	16,805	16,805
Amortization of transition obligation
Amortization of PSC adjustment
FAS88 recognition - loss on curtailment
Amortization of unrecognized actuarial loss (gain)	705,532	829,366	917,597
Net periodic benefit cost (benefit)	1,043,758	1,212,252	1,373,210
Prepaid (accrued) benefit liability - Net amount recognized at end of period	(6,834,540)	(6,399,408)	(6,019,101)
Discount rate	4.00%	5.00%	5.25%
Expected return on assets	77.50%	8.00%	8.00%
Post-retirement Benefits
Service cost	14,388	13,819	26,229
Interest cost	41,569	41,920	48,987
Expected return on plan assets
Amortization of prior service cost	(11,691)	(11,691)	(10,432)
Amortization of transition obligation
Amortization of PSC adjustment
FAS88 recognition - loss on curtailment
Amortization of unrecognized actuarial loss (gain)	(24,473)	(36,072)	(28,659)
Net periodic benefit cost (benefit)	19,793	7,976	36,125
Prepaid (accrued) benefit liability - Net amount recognized at end of period	$ (1,187,118)	$ (857,645)	$ (825,942)
Discount rate	4.00%	5.00%	5.25%
Expected return on assets	8.00%	8.00%	8.00%

The amount of gains or losses recognized in net periodic benefit cost.

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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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The amount of the transition obligation or asset recognized in net periodic benefit cost.

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The interest rate used to adjust for the time value of money for the plan.

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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Changes in the defined benefit obligation, not otherwise separately disclosed in the financial statements.

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No definition available.

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Amount of other defined benefit plan costs.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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- Definition

This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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