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INVESTMENT ASSETS, NET - Additional Information (Details)	3 Months Ended		9 Months Ended
	Jan. 31, 2021 USD ($) ft² a	Jan. 31, 2020 USD ($)	Jan. 31, 2021 USD ($) ft² a	Jan. 31, 2020 USD ($)	Apr. 30, 2020 a
Area of Land | a	6,000		6,000		6,000
Depreciation on buildings | $	$ 152,000	$ 87,000	$ 415,000	$ 366,000
Retail Building
Area of Land	14,000		14,000
Florida | Warehouse and Office Buildings
Area of Land	204,000		204,000
New Mexico
Area of Land | a	12,000		12,000		12,000
New Mexico | Retail Building
Area of Land	14,000		14,000

X

- Definition

The cumulative amount of depreciation for buildings.

+ References

No definition available.

+ Details

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X

- Definition

Area of land held.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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X

- Details

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- Details

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