Consolidated Balance Sheets [Parenthetical] - $ / shares	Oct. 31, 2015	Apr. 30, 2015
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	8,284,704	8,281,704
Treasury stock, shares	225,250	225,250