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Inventories (Details) (USD $)	Jul. 31, 2012	Jan. 31, 2012
Raw materials	$ 18,335,643	$ 21,213,423
Work-in-process	2,659,855	1,790,510
Finished goods	22,023,716	22,664,422
Inventory, Net, Total	$ 43,019,214	$ 45,668,355

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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