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Preferred and Common Stock (Tables)
 12 Months Ended
Apr. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Options Activity
Information concerning the issuance of stock options under the Plan and Prior Plans is presented in the following table:
 
 
Number
of option shares
 
Weighted
average option
exercise price
Outstanding at April 30, 2012
1,053,509

 
$
32.59

Granted
—

 
—

Exercised
(198,200
)
 
23.82

Forfeited
(500
)
 
14.08

Outstanding at April 30, 2013
854,809

 
$
34.64

Granted
—

 
—

Exercised
(140,785
)
 
23.93

Forfeited
(2,000
)
 
44.39

Outstanding at April 30, 2014
712,024

 
$
36.73

Granted
—

 
—

Exercised
(310,224
)
 
36.96

Forfeited
—

 
—

Outstanding at April 30, 2015
401,800

 
$
36.55
Schedule of Shares Outstanding and Weighted-Average Remaining Contractual Life by Exercise Range
The number of shares and weighted average remaining contractual life of the options by range of applicable exercise prices at April 30, 2015 were as follows:
 
Range of
exercise prices
Number
of shares
 
Weighted average
exercise price
 
Weighted average remaining
contractual life (years)
20.68-24.11
7,000

 
22.62

 
1.2
25.26-26.92
159,600

 
25.61

 
3.8
44.39
235,200

 
44.39

 
6.2
 
401,800

 
 
 
 
Schedule of Restricted Stock Units Award Activity
Information concerning the issuance of restricted stock units under the Plan is presented in the following table:
 
 
 
Unvested at April 30, 2012
38,198

Granted
46,998

Vested
(14,000
)
Forfeited
—

Unvested at April 30, 2013
71,196

Granted
91,650

Vested
(14,150
)
Forfeited
(150
)
Unvested at April 30, 2014
148,546

Granted
91,000

Vested
(38,198
)
Forfeited
(7,418
)
Unvested at April 30, 2015
193,930