Pension and Other Post-retirement Benefit Plans (Details) (USD $)	12 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Pension Benefits
Benefit Obligation at beginning of year	$ 15,857,827	$ 15,199,060	$ 14,900,272
Service cost	328,661	333,060	333,425
Interest cost	771,341	776,058	797,680
Participant contributions
Actuarial (gain) loss	2,202,387	338,403	(75,605)
Benefits paid	(827,657)	(788,754)	(756,712)
Curtailments
Benefit obligation at end of year	18,332,559	15,857,827	15,199,060
Fair value of plan assets at beginning of year	9,458,419	9,179,959	8,813,215
Actual return on plan assets	1,532,489	19,398	699,286
Company contributions	1,339,796	1,047,816	424,170
Fair value of plan assets at end of year	11,498,019	9,458,419	9,179,959
Funded status	(6,834,540)	(6,399,408)	(6,019,101)
Unrecognized net actuarial loss/(gain)	4,881,181	4,133,593	3,900,917
Unrecognized PSC adjustment
Unrecognized prior service cost	(44,180)	(60,598)	(77,403)
Unrecognized net transition asset (obligation)
Additional minimum liability
Accrued contribution
(Accrued)/prepaid pension cost as of beginning of fiscal year	(2,205,217)	(2,040,781)	(1,091,741)
Pension (cost) income	(862,576)	(1,043,758)	(1,212,252)
Contributions	1,339,796	1,047,816	424,170
Change in receivable contribution	(181,182)	(168,494)	(160,958)
Net benefits paid
Change in additional minimum liability
(Accrued)/prepaid pension cost as of end of fiscal year	(1,909,179)	(2,205,217)	(2,040,781)
Discount rate	4.00%	5.00%	5.25%
Expected return on assets	77.50%	8.00%	8.00%
Rate of compensation increase	2.00%	2.00%	3.00%
Measurement Date	2012-10-01	2011-10-01	2010-10-01
Post-retirement Benefits
Benefit Obligation at beginning of year	857,645	825,942	1,513,523
Service cost	14,388	13,819	26,229
Interest cost	41,569	41,920	48,987
Participant contributions	88,000	122,000	113,000
Actuarial (gain) loss	82,701	30,964	(431,212)
Benefits paid	(41,000)	(177,000)	(162,000)
Curtailments	243,815		(282,585)
Benefit obligation at end of year	1,187,118	857,645	825,942
Fair value of plan assets at beginning of year
Actual return on plan assets
Company contributions	53,000	55,000	49,000
Fair value of plan assets at end of year
Funded status	(1,187,118)	(857,645)	(825,942)
Unrecognized net actuarial loss/(gain)	(186,506)	(293,680)	(360,716)
Unrecognized PSC adjustment
Unrecognized prior service cost
Unrecognized net transition asset (obligation)	160,724	(94,782)	(106,473)
Additional minimum liability
Accrued contribution
(Accrued)/prepaid pension cost as of beginning of fiscal year	(1,246,107)	(1,293,131)	(1,306,006)
Pension (cost) income	(29,793)	(5,976)	(36,125)
Contributions
Change in receivable contribution
Net benefits paid	63,000	53,000	49,000
Change in additional minimum liability
(Accrued)/prepaid pension cost as of end of fiscal year	$ (1,212,900)	$ (1,246,107)	$ (1,293,131)
Discount rate	4.00%	5.00%	5.25%
Expected return on assets	8.00%	8.00%	8.00%
Rate of compensation increase	2.00%	2.00%	3.00%
Measurement Date	2012-10-01	2011-10-01	2010-10-01

Amount of accrued pension costs.

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The accrued benefit plan contribution as identified in the change in benefit obligations.

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The additional minimum pension liability as identified in the change in benefit obligations.

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The date of measurement of the benefit plan obligation.

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The change in the additional minimum liability during the period in the calculation of pension benefit obligation.

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The amount of change in receivable contribution during the period in the calculation of pension benefit obligation.

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The amount of contributions recognized during the period in the calculation of pension benefit obligation.

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The amount of pension cost/income recognized during the period in the calculation of pension benefit obligation.

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The amount of net benefits paid during the period in the calculation of pension benefit obligation.

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The cumulative unrecognized amount of gain (loss) from a decision to temporarily deviate from the substantive plan, or from a change in benefit obligation or plan asset value from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover or salary scale.

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The cumulative unrecognized amount of net transition assets as identified in the change in benefit obligations.

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The cumulative unrecognized amount of prior service cost as identified in the change in benefit obligations.

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The cumulative unrecognized amount of PSC adjustment as identified in the change in benefit obligations.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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Amount of gain (loss) from a decision to temporarily deviate from the substantive plan, or from a change in benefit obligation or plan asset value from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover or salary scale.

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

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Expected rate of compensation increases (for pay-related plans).

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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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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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The increase in the fair value of plan assets from contributions made by the employer.

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The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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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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