Stock-Based Compensation (Tables)

12 Months Ended

Apr. 30, 2017

Stock-Based Compensation

Schedule of weighted average assumptions used to estimate fair value of stock options granted

	Year Ended April 30,
	2017			2016			2015
Expected term (in years)		—			6.00			6.00
Expected volatility		—	%		36.14	%		44.65	%
Risk-free interest rate		—	%		1.88	%		1.92	%
Expected dividend		—			—			—
Weighted average fair value at grant date	$	—		$	10.18		$	14.05

Schedule of stock option plans

	Restated 2006 Plan			2002 Plan			1992 Plan
		Weighted			Weighted			Weighted
		Average			Average			Average
		Exercise			Exercise			Exercise
	Shares	Price		Shares	Price		Shares	Price
Outstanding at April 30,  2014	713,110		23.20	48,511		7.18	105,079		0.52
Options granted	85,599		31.27	—		—	—		—
Options exercised	(30,000)		23.81	(3,518)		2.13	(1,500)		0.59
Options canceled	(111,592)		24.75	—		—	—		—
Outstanding at April 30, 2015	657,117		23.96	44,993		7.57	103,579		0.59
Options granted	128,000		26.83	—		—	—		—
Options exercised	(43,000)		21.81	(31,161)		5.70	(10,720)		0.59
Options canceled	(58,318)		25.98	(8)		2.13	—		—
Outstanding at April 30, 2016	683,799		24.46	13,824		11.79	92,859		0.59
Options granted	—		—	—		—	—		—
Options exercised	(167,310)		22.32	(9,601)		11.79	(27,219)		0.59
Options canceled	(64,865)		26.76	(4,223)		11.79	—		—
Outstanding at April 30, 2017	451,624		24.92	—		—	65,640		0.59
Options exercisable at April 30, 2017	311,506	$	24.52	—	$	—	65,640	$	0.59

Schedule of the status of the Company's non-vested stock options

		Weighted
		Average
		Grant Date
Non-vested Options	Options	Fair Value
Non-vested at April 30, 2016	292,513	$	10.53
Granted	—		—
Expired	—		—
Canceled	(60,619)		10.71
Vested	(91,776)		10.07
Non-vested at April 30, 2017	140,118	$	10.76

Schedule of information concerning outstanding and exercisable options

				Options Outstanding
					Weighted
					Average			Options Exercisable
					Remaining	Weighted			Weighted
				As of	Contractual	Average		As of	Average
				April 30,	Life In	Exercise		April 30,	Exercise
Range of Exercise Prices				2017	Years	Price		2017	Price
$	0.59	-	18.32	115,640	4.25	$	8.15	108,040	$	7.45
	18.33	-	22.90	98,000	4.56		19.87	74,000		19.97
	22.91	-	26.99	134,600	5.66		25.77	68,600		24.91
	27.00	-	29.26	100,000	5.70		28.00	80,000		28.18
	29.27	-	32.19	69,024	5.54		30.94	46,506		30.78
$	0.59	-	32.19	517,264	5.13	$	21.83	377,146	$	20.36

Schedule of Company's restricted stock awards

	Restated 2006 Plan
		Weighted
		Average
		Grant Date
	Shares	Fair Value
Unvested stock at April 30, 2016	427,064	$	25.99
Stock granted	126,557		25.33
Stock vested	(134,270)		24.82
Stock canceled	(56,093)		25.29
Unvested stock at April 30, 2017	363,258	$	26.30