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REVENUES - Other revenues (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Oct. 31, 2022
Oct. 31, 2021
Other revenues        
Sale of buildings   $ 6,750   $ 6,750
Oil and gas royalties $ 49 40 $ 106 175
Miscellaneous other revenues 345 37 384 287
Other Revenue, Net $ 394 $ 6,827 $ 490 $ 7,212