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Significant Accounting Policies (Details) - Inventories (USD $)	Aug. 31, 2013	May 31, 2013
Inventories [Abstract]
Raw materials	$ 908,000	$ 787,000
Work in progress	620,000	555,000
Finished products	263,000	229,000
Total	$ 1,791,443	$ 1,571,221

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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