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Significant Accounting Policies (Detail) - Inventories (USD $)	Aug. 31, 2012	May 31, 2012
Raw materials	$ 823,921	$ 896,488
Work in progress	733,143	553,236
Finished products	263,685	371,348
Total	$ 1,820,749	$ 1,821,072

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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