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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Apr. 30, 2012
Inventories [Abstract]
Raw materials and subassemblies	$ 1,422	$ 1,775
Work-in-process	61	63
Finished Goods	626	821
Total	$ 2,109	$ 2,659

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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