Condensed Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2013	Apr. 30, 2013
Allowance for doubtful accounts (in Dollars)	$ 288	$ 288
Preferred stock, par value (in Dollars per share)	$ 1.00	$ 1.00
Common stock par value (in Dollars per share)	$ 1.00	$ 1.00
Common stock, shares issued (in Shares)	9,164	9,164
Treasury stock, shares (in Shares)	652	701