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Inventories (Details) (USD $)	Apr. 30, 2012	Apr. 30, 2011
Inventory, Raw Materials, Net of Reserves	$ 848,000	$ 983,000
Inventory, Work in Process, Net of Reserves	296,000	300,000
Inventory, Finished Goods, Net of Reserves	85,000	118,000
Inventory, Net	$ 1,229,000	$ 1,401,000

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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