Stock Appreciation Rights Stock Appreciation Rights Rollforward (Details) (Stock Appreciation Rights (SARs) [Member], USD $)	3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jun. 17, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at Beginning of Year	320,000	280,000	360,000
SARs Granted	40,000	40,000
SARs Exercised	0	0
SARs Forfeited	0	0
Outstanding at Ending of Year		320,000	360,000
SARs Exercisable at End of Year		243,000	280,000
Weighted Average [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average at Beginning of Year	$ 0.409	$ 0.429	$ 0.409
Weighted Average Granted	$ 0.410	$ 0.270
Weighted Average Exercised	$ 0.000	$ 0.000
Weighted Average Forfeitures	$ 0.000	$ 0.000
Weighted Average at Ending of Year		$ 0.409	$ 0.409
Weighted Average Fair Value of SARs Granted During the Year	$ 0.410	$ 0.270
Weighted Average SARs Exercisable at End of Year		$ 0.418	$ 0.415