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INVENTORIES (Details) (USD $)
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Jan. 31, 2013
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Jan. 31, 2012
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|---|---|---|
| INVENTORIES [Abstract] | ||
| Raw materials | $ 13,262,612 | $ 12,673,210 |
| Work in process | 2,966,664 | 2,808,747 |
| Finished goods | 1,641,444 | 2,365,186 |
| Inventories, net | 17,870,720 | 17,847,143 |
| Inventory valued using LIFO | 2,367,256 | 1,790,705 |
| Difference between LIFO value and replacement cost | 1,599,392 | 1,553,153 |
| Inventory value over tax basis of inventory | $ 867,107 | $ 866,900 |