Preferred And Common Stock (Tables)

12 Months Ended

Apr. 30, 2012

Preferred And Common Stock [Abstract]

Stock Option Activity

	Number of			Weighted
	restricted	Number of		average option
	stock units	option shares		exercise price
Balance at April 30, 2009	-	678,000	$	20.45
Granted	-	377,000		25.27
Exercised	-	(83,450)		14.85
Forfeited	-	(12,000)		24.41
Balance at April 30, 2010	-	959,550	$	22.78
Granted	28,000	-		0.00
Exercised	-	(184,441)		20.24
Forfeited	-	-		0.00
Balance at April 30, 2011	28,000	775,109	$	23.38
Granted	38,198	441,000		44.39
Exercised	-	(159,600)		20.36
Forfeited	-	(3,000)		36.19
Balance at April 30, 2012	66,198	1,053,509	$	32.59

Schedule Of Range Of Exercise Prices And Weighted Average Remaining Contractual Life Of Outstanding Options

	Range of	Number		Weighted average	Weighted average remaining
	exercise prices	of shares		exercise price	contractual life (years)
$	11.86 – 17.64	45,500	$	14.68	1.5
	20.68 – 26.92	569,009		24.92	6.1
	44.39	439,000		44.39	9.2
		1,053,509