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INVESTMENT ASSETS, NET (Details) - USD ($)
$ in Thousands
Apr. 30, 2021
Apr. 30, 2020
INVESTMENT ASSETS, NET    
Land held for long-term investment $ 9,775 $ 9,751
Construction in process   2,320
Buildings 10,003 13,096
Less accumulated depreciation (6,196) (6,523)
Buildings, net 3,807 6,573
Total $ 13,582 $ 18,644