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INVESTMENT ASSETS, NET (Details) - USD ($)
$ in Thousands
Jan. 31, 2022
Apr. 30, 2021
INVESTMENT ASSETS, NET    
Land held for long-term investment $ 9,775 $ 9,775
Buildings   10,003
Less accumulated depreciation   (6,196)
Buildings, net   3,807
Total $ 9,775 $ 13,582