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PROPERTY, PLANT AND EQUIPMENT (Details) (USD $)
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12 Months Ended |
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Jan. 31, 2013
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Jan. 31, 2012
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Jan. 31, 2011
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| Property, Plant and Equipment [Line Items] |
|
|
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| Property, Plant and Equipment, Gross |
$ 47,343,457 |
$ 45,801,441 |
|
| Less accumulated depreciation |
27,843,864 |
26,479,005 |
|
| Property, Plant and Equipment, Net |
19,499,593 |
19,322,436 |
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| Depreciation of property, plant and equipment |
1,919,497 |
1,806,567 |
1,772,668 |
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Land [Member]
|
|
|
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| Property, Plant and Equipment [Line Items] |
|
|
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| Property, Plant and Equipment, Gross |
1,949,449 |
1,946,228 |
|
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Building and improvements [Member]
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|
|
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| Property, Plant and Equipment [Line Items] |
|
|
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| Property, Plant and Equipment, Gross |
21,799,914 |
20,980,144 |
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Machinery and equipment [Member]
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|
|
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| Property, Plant and Equipment [Line Items] |
|
|
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| Property, Plant and Equipment, Gross |
14,975,564 |
14,201,851 |
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Furniture and fixtures [Member]
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|
|
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| Property, Plant and Equipment [Line Items] |
|
|
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| Property, Plant and Equipment, Gross |
6,172,741 |
5,514,662 |
|
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Automotive equipment [Member]
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|
|
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| Property, Plant and Equipment [Line Items] |
|
|
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| Property, Plant and Equipment, Gross |
1,607,259 |
1,504,380 |
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Construction in progress [Member]
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|
|
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| Property, Plant and Equipment [Line Items] |
|
|
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| Property, Plant and Equipment, Gross |
$ 838,530 |
$ 1,654,176 |
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