Preferred and Common Stock (Tables)

12 Months Ended

Apr. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Restricted Stock and Restricted Stock Unit Grants

The following table summarizes the most recent compensation grants made during the three-year period ended April 30, 2017:

Date of Grant	Type of Grant	Shares Granted	Recipients	Vesting Date	Fair Value at Grant Date
June 6, 2014	Restricted Stock Units	91,000	Officers & Key employees	June 6, 2017	$6,584
June 6, 2014	Restricted Stock	30,538	Officers & Key employees	Immediate (Annual performance goal)	$2,209
September 19, 2014	Restricted Stock	13,955	Non-employee board members	Immediate	$990
June 5, 2015	Restricted Stock Units	104,200	Officers & Key employees	June 5, 2018	$9,135
June 5, 2015	Restricted Stock	48,913	Officers & Key employees	Immediate (Annual performance goal)	$4,288
September 18, 2015	Restricted Stock	7,748	Non-employee board members	Immediate	$856
April 12, 2016	Restricted Stock Units	10,000	CEO	20% each May 1, 2017-2021	$1,060
June 3, 2016	Restricted Stock Units	111,150	Officers & Key employees	June 3, 2019	$13,849
June 3, 2016	Restricted Stock	40,996	Officers & Key employees	Immediate (Annual performance goal)	$5,108
September 16, 2016	Restricted Stock	8,941	Non-employee board members	Immediate	$1,064

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, 2014	712,024		$	36.73
Granted	—		—
Exercised	(310,224	)	36.96
Forfeited	—		—
Outstanding at April 30, 2015	401,800		$	36.55
Granted	—		—
Exercised	(108,100	)	34.37
Forfeited	(2,500	)	25.26
Outstanding at April 30, 2016	291,200		$	37.46
Granted	—		—
Exercised	(69,150	)	34.08
Forfeited	—		—
Outstanding at April 30, 2017	222,050		$	38.51

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, 2017 were as follows:

Range of exercise prices	Number of shares	Weighted average exercise price	Weighted average remaining contractual life (years)
25.26-25.49	62,350	25.28	2.2
26.51-26.92	6,500	26.73	0.6
44.39	153,200	44.39	4.2
	222,050

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, 2014	148,546
Granted	91,000
Vested	(38,198	)
Forfeited	(7,418	)
Unvested at April 30, 2015	193,930
Granted	114,200
Vested	(31,480	)
Forfeited	(3,750	)
Unvested at April 30, 2016	272,900
Granted	111,150
Vested	(73,000	)
Forfeited	(7,650	)
Unvested at April 30, 2017	303,400