INCOME TAXES: (Details 1) - USD ($) $ in Thousands	Apr. 30, 2015	Apr. 30, 2014
Deferred income tax assets:
State tax loss carryforwards	$ 4,272	$ 3,340
Accrued pension costs	4,274	2,376
U.S. Federal NOL carryforward	0	4,946
Vacation accrual	210	405
Intangibles and deductible goodwill	4,835	5,560
Real estate basis differences	4,296	3,309
Other	177	0
Total deferred income tax assets	18,064	19,936
Deferred income tax liabilities:
Depreciable assets	(3,776)	(4,049)
Deferred gains on investment assets	(4,423)	(4,423)
Capitalized costs for financial reporting purposes, expensed for tax	(371)	(451)
Other	0	(318)
Total deferred income tax liabilities	(8,570)	(9,241)
Valuation allowance for realization of state tax loss carryforwards	(3,657)	(2,627)
Net deferred income tax asset	$ 5,837	$ 8,068