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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Oct. 31, 2012	Apr. 30, 2012
Accounts receivable, allowance for doubtful accounts	$ 400	$ 400
Preferred stock, par value	$ 1.00	$ 1.00
Common stock, par value	$ 1.00	$ 1.00
Common stock, issued	9,163,940	9,163,940
Common stock reacquired and held in treasury, shares	756,987	800,787

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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