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Consolidated Balance Sheets (Parenthetical) (USD $)	Apr. 30, 2013	Apr. 30, 2012
Consolidated Balance Sheets [Abstract]
Preferred stock, no par value	$ 0	$ 0
Preferred stock, shares issued	0	0
Common stock, no par value	$ 0	$ 0
Common stock, shares issued	38,352,509	38,140,309
Common stock, shares outstanding	38,352,509	38,140,309

X

- Definition

Issuance value per share of no-par value common stock; generally not indicative of the fair market value per share.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Issuance value per share of no-par value, nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share.

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