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INCOME TAXES - Components of the net deferred income taxes (Details) - USD ($)
$ in Thousands
Apr. 30, 2023
Apr. 30, 2022
Deferred income tax assets:    
State tax loss carryforwards $ 2,921 $ 4,199
U.S. federal NOL carryforward 10,010 0
Accrued pension costs 0 9
Vacation accrual 9 14
Real estate basis differences 3,233 3,441
Other 284 230
Total deferred income tax assets 16,457 7,893
Deferred income tax liabilities:    
Depreciable assets (19)  
Deferred gains on investment assets (2,474) (2,387)
Prepaid pension costs (576) (363)
Other (43) (36)
Total deferred income tax liabilities (3,112) (2,786)
Valuation allowance for realization of certain deferred income tax assets (852) (4,149)
Net deferred income tax asset $ 12,493 $ 958