INCOME TAXES (Details 1) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Deferred income tax assets:
State tax loss carryforwards	$ 3,927	$ 3,942
Accrued pension costs	3,827	4,927
U.S. Federal NOL carryforward	5,592	4,476
Canadian NOL carryforward	133	0
Vacation accrual	698	700
Intangibles and deductible goodwill	6,595	7,377
Real estate basis differences	2,523	1,045
Other	103	0
Total deferred income tax assets	23,398	22,467
Deferred income tax liabilities:
Reserve for periodical returns	(2,036)	(2,009)
Depreciable assets	(4,446)	(4,358)
Deferred gains on investment assets	(4,428)	(4,679)
Capitalized costs for financial reporting purposes, expensed for tax	(606)	(536)
Other	0	(315)
Total deferred income tax liabilities	(11,516)	(11,897)
Valuation allowance for realization of state tax loss carryforwards	(2,268)	(2,544)
Deferred income taxes	$ 9,614	$ 8,026