Preferred And Common Stock (Tables)

12 Months Ended

Apr. 30, 2013

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, 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
Granted	46,998	-		0.00
Exercised	-	(198,200)		23.82
Forfeited	-	(500)		14.08
Balance at April 30, 2013	113,196	854,809	$	34.64

Schedule of stock options granted significant assumptions

Risk-free interest rate	2.14%
Expected option life	6.11 years
Expected volatility	37%
Expected dividend yield	1.58%

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)
$	14.08 - 17.64	20,500	$	15.63	0.9
	20.68 - 26.92	404,309		25.23	5.3
	44.39	430,000		44.39	8.2
		854,809