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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Apr. 30, 2012	Apr. 30, 2011
Consolidated Balance Sheets [Abstract]
Allowance for receivables	$ 311	$ 250
Common stock, par value	$ 2.50	$ 2.50
Common stock, shares authorized	5,000	5,000
Common stock, shares issued	2,620	2,620
Common stock, shares outstanding	2,579	2,578
Treasury stock, shares	40	42

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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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Face amount or stated value of common stock per share; generally not indicative of the fair market value per share.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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