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Inventories (Details) (USD $)	Apr. 30, 2013	Jan. 31, 2013
Raw materials	$ 17,048,059	$ 16,361,872
Work-in-process	1,709,825	1,812,788
Finished goods	20,333,092	21,096,015
Inventory, Net, Total	$ 39,090,976	$ 39,270,675

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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