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Inventories (Details) (USD $)	Apr. 30, 2014	Jan. 31, 2014
Inventory [Line Items]
Raw materials	$ 16,849,408	$ 16,348,861
Work-in-process	1,417,790	1,292,740
Finished goods	22,103,300	22,202,708
Inventory, Net, Total	$ 40,370,498	$ 39,844,309

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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