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REVENUES - OTHER REVENUES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
OTHER REVENUES        
Oil & gas royalties $ 25 $ 0 $ 36 $ 0
Private infrastructure reimbursement covenants 245 140 378 231
Public improvement district reimbursements 69 26 244 26
Miscellaneous other revenue 37 187 87 231
Other Revenue, Net $ 376 $ 353 $ 745 $ 488