|
EMPLOYEE BENEFIT PLANS, Change in benefit obligation, change in plan assets and amounts recognized on the balance sheet (Details) (USD $)
|
12 Months Ended |
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Jan. 31, 2013
|
Jan. 31, 2012
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Jan. 31, 2011
|
| Change in benefit obligation [Roll Forward] |
|
|
|
| Benefit obligation at beginning of year |
$ 26,059,763 |
$ 20,675,319 |
|
| Service cost |
224,138 |
205,725 |
211,500 |
| Interest cost |
1,088,872 |
1,121,492 |
1,118,007 |
| Actuarial loss |
940,869 |
5,371,311 |
|
| Administrative expenses |
(164,722) |
(259,229) |
|
| Benefits paid |
(1,102,251) |
(1,054,855) |
|
| Benefit obligation at end of year |
27,046,669 |
26,059,763 |
20,675,319 |
| Change in plan assets [Roll Forward] |
|
|
|
| Fair value of plan assets at beginning of year |
16,343,172 |
14,807,545 |
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| Actual gain (loss) on plan assets |
1,438,608 |
(148,700) |
|
| Employer contribution |
1,674,244 |
2,998,411 |
|
| Administrative expenses |
(164,722) |
(259,229) |
|
| Benefits paid |
(1,102,251) |
(1,054,855) |
|
| Fair value of plan assets at end of year |
18,189,051 |
16,343,172 |
14,807,545 |
| Funded status |
(8,857,618) |
(9,716,591) |
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| Unrecognized actuarial loss |
13,449,383 |
13,167,800 |
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| Net amount recognized |
4,591,765 |
3,451,209 |
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| Amounts recognized in the consolidated balance sheets consist of [Abstract] |
|
|
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| Accrued benefit liability - short term |
(94,591) |
(94,583) |
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| Accrued benefit liability - long term |
(8,763,027) |
(9,622,008) |
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| Accumulated other comprehensive loss |
13,449,383 |
13,167,800 |
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| Net amount recognized |
4,591,765 |
3,451,209 |
|
| Accumulated benefit obligation in excess of assets |
27,046,669 |
26,059,763 |
|
| Projected benefit obligation in excess of assets |
27,046,669 |
26,059,763 |
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| Fair value of plan assets in excess of assets |
18,189,051 |
16,343,172 |
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| Company contributions to pension plans |
1,674,244 |
|
|
| Expected additional company contributions in current fiscal year |
|
1,194,591 |
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| Expected future benefit payments [Abstract] |
|
|
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| 2014 |
1,240,819 |
|
|
| 2015 |
1,314,172 |
|
|
| 2016 |
1,369,542 |
|
|
| 2017 |
1,408,435 |
|
|
| 2018 |
1,456,832 |
|
|
| 2019-2023 |
7,707,801 |
|
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| Total expected future benefits |
$ 14,497,601 |
|
|
| Weighted average assumptions used in accounting for benefit obligations [Abstract] |
|
|
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| Discount rate (in hundredths) |
4.00% |
4.25% |
5.50% |
| Expected long-term rate of return on assets (in hundredths) |
7.50% |
7.50% |
8.50% |
| Weighted average assumptions used in accounting for net projected pension cost [Abstract] |
|
|
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| Discount rate (in hundredths) |
4.25% |
5.50% |
5.75% |
| Expected long-term rate of return on assets (in hundredths) |
7.50% |
8.50% |
8.50% |