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REVENUES - Building sales and other revenues (Details) - USD ($)
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Building sales and other revenues    
Sales of buildings and other land $ 9,493,000 $ 665,000
Oil and gas royalties 135,000 608,000
Public improvement district reimbursements 390,000 113,000
Private infrastructure reimbursement covenants 549,000 324,000
Miscellaneous other revenues 532,000 301,000
Other Revenue, Net $ 11,099,000 $ 2,011,000