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INVESTMENT ASSETS: (Details) - USD ($)
$ in Thousands
Apr. 30, 2020
Apr. 30, 2019
INVESTMENT ASSETS:    
Land held for long-term investment $ 9,751 $ 9,706
Construction in process 2,320 0
Warehouse and office facilities 13,096 13,527
Less accumulated depreciation (6,523) (6,006)
Real Estate Investment Property, at Cost 6,573 7,521
Real Estate Investment Property, Net, Total $ 18,644 $ 17,227