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INCOME TAXES - Components of the net deferred income taxes (Details) - USD ($)
$ in Thousands
Apr. 30, 2024
Apr. 30, 2023
Deferred income tax assets:    
State tax loss carryforwards $ 2,748 $ 2,921
U.S. federal NOL carryforward 8,891 10,010
Accrued pension costs 0 0
Vacation accrual 27 9
Real estate basis differences 2,444 3,233
Other 390 284
Total deferred income tax assets 14,500 16,457
Deferred income tax liabilities:    
Depreciable assets (50) (19)
Deferred gains on investment assets (2,377) (2,474)
Prepaid pension costs 0 (576)
Other (46) (43)
Total deferred income tax liabilities (2,473) (3,112)
Valuation allowance for realization of certain deferred income tax assets (989) (852)
Net deferred income tax asset $ 11,038 $ 12,493