BENEFIT PLANS: (Tables)

12 Months Ended

Apr. 30, 2013

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

Net periodic pension cost for 2013, 2012 and 2011 was comprised of the following components (in thousands):

	Year Ended April 30,
	2013		2012		2011
Interest cost on projected benefit obligation	$	1,454	$	1,681	$	1,706
Expected return on assets		(1,596)		(1,675)		(1,565)
Plan expenses		226		220		227
Recognized net actuarial loss		1,802		1,145		1,155
Total cost recognized in pretax income		1,886		1,371		1,523
Cost recognized in pretax other comprehensive income		(1,185)		5,094		96
Net periodic pension cost	$	701	$	6,465	$	1,619

Schedule of Assumptions Used [Table Text Block]

Assumptions used in determining net periodic pension cost and the benefit obligations were:

	Year Ended April 30,
	2013		2012		2011
Discount rate used to determine net periodic pension cost	3.97	%	5.05	%	5.44	%
Discount rate used to determine pension benefit obligation	3.47	%	3.97	%	5.05	%
Expected long-term rate of return on assets on assets	8.00	%	8.00	%	8.00	%

Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

The following table sets forth changes in the pension plan’s benefit obligations and assets, and summarizes components of amounts recognized in the Company’s consolidated balance sheets (in thousands): 

	April 30,
	2013		2012		2011
Change in benefit obligation:
Benefit obligation at beginning of year	$	37,899	$	34,550	$	32,568
Interest cost		1,454		1,681		1,706
Actuarial (gain) loss		1,536		3,992		2,861
Benefits paid		(2,307)		(2,324)		(2,585)
Benefit obligation at end of year	$	38,582	$	37,899	$	34,550
Change in plan assets:
Fair value of plan assets at beginning of year	$	20,222	$	21,931	$	20,493
Company contributions		4,572		1,407		1,075
Actual return on plan assets		2,523		(568)		3,168
Benefits paid		(2,307)		(2,324)		(2,585)
Plan expenses		(233)		(224)		(220)
Fair value of plan assets at end of year	$	24,777	$	20,222	$	21,931
Funded (underfunded) status:	$	(13,805)	$	(17,677)	$	(12,619)
Recognition of underfunded status:
Accrued pension cost	$	(13,805)	$	(17,677)	$	(12,619)

Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]

The following table summarizes the amounts recorded in accumulated other comprehensive loss, which have not yet been recognized as a component of net periodic pension costs (in thousands):

	Year Ended April 30,
	2013		2012		2011
Pre-tax accumulated comprehensive loss	$	18,806	$	19,991	$	14,897

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

The following table summarizes the changes in accumulated other comprehensive loss related to the pension plan for the years ended April 30, 2013 and 2012 (in thousands):

	Pension Benefits
	Pre-tax		Net of Tax
Accumulated comprehensive loss, May 1, 2011	$	14,897	$	9,140
Net actuarial loss		6,239		3,868
Amortization of net loss		(1,145)		(710)
Accumulated comprehensive loss, April 30, 2012		19,991		12,298
Net actuarial loss		617		383
Amortization of net loss		(1,802)		(1,117)
Accumulated comprehensive loss, April 30, 2013	$	18,806	$	11,564

Schedule of Allocation of Plan Assets [Table Text Block]

The average asset allocation for the retirement plan by asset category was as follows:

	April 30,
	2013		2012
Equity securities	67	%	76	%
Fixed income securities	28		20
Other (principally cash and cash equivalents)	5		4
Total	100	%	100	%

Schedule of Changes in Fair Value of Plan Assets [Table Text Block]

The following tables set forth by level within the fair value hierarchy the pension plan’s assets at fair value as of April 30, 2013 and 2012 (in thousands):

2013:
	Total		Level 1		Level 2		Level 3
Cash and cash equivalents	$	1,251	$	1,251	$	-	$	-
Investments at fair value:
Equity securities		16,669		16,669		-		-
Corporate bonds and debentures		6,215		-		6,215		-
U.S. Treasury and government agency securities		642		640		2		-
Total assets at fair value	$	24,777	$	18,560	$	6,217	$	-

2012:
	Total		Level 1		Level 2		Level 3
Cash and cash equivalents	$	780	$	780	$	-	$	-
Investments at fair value:
Equity securities		15,376		15,376		-		-
Corporate bonds and debentures		1,773		-		1,773		-
U.S. Treasury and government agency securities		2,293		1,624		669		-
Total assets at fair value	$	20,222	$	17,780	$	2,442	$	-