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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Apr. 30, 2012
Inventories
Inventory, Work in Process, Net of Reserves	$ 1,944	$ 1,831
Inventory, Finished Goods, Net of Reserves	3,233	3,570
Inventory, Raw Materials, Net of Reserves	6,540	6,359
Inventory, Net	$ 11,717	$ 11,760

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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