REVENUES - Building sales and other revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Building sales and other revenues
Sale of buildings		$ 8,439
Oil and gas royalties	$ 146	276
Landscaping revenues	585
Miscellaneous other revenues	595	446
Total	$ 1,326	$ 9,161