NOTE E - INVENTORIES (Details) - Schedule of Inventory, Current (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Apr. 30, 2013
Schedule of Inventory, Current [Abstract]
Raw Materials and Component Parts	$ 22,724	$ 21,066
Work in Progress	13,379	13,665
Finished Goods	3,118	2,790
	$ 39,221	$ 37,521

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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