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REVENUES - Other revenues (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Other revenues    
Oil and gas royalties $ 135 $ 11
Public improvement district reimbursements 309 175
Private infrastructure reimbursement covenants 52 133
Miscellaneous other revenues 410 400
Other Revenue, Net $ 906 $ 719