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INCOME TAXES - Components of the net deferred income taxes (Details) - USD ($)
$ in Thousands
Apr. 30, 2022
Apr. 30, 2021
Deferred income tax assets:    
State tax loss carryforwards $ 4,199 $ 4,296
U.S. federal NOL carryforward 0 1,384
Accrued pension costs 9 0
Vacation accrual 14 14
Real estate basis differences 3,441 3,976
Other 230 303
Total deferred income tax assets 7,893 9,973
Deferred income tax liabilities:    
Depreciable assets 0 (749)
Deferred gains on investment assets (2,387) (2,300)
Prepaid pension costs (363) (178)
Other (36) (31)
Total deferred income tax liabilities (2,786) (3,258)
Valuation allowance for realization of certain deferred income tax assets (4,149) (3,966)
Net deferred income tax asset $ 958 $ 2,749