Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jul. 31, 2011	Apr. 30, 2011
Condensed Consolidated Balance Sheets
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Common stock, par value
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	14,314,412	14,295,540
Common stock, shares outstanding	14,314,412	14,295,540