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REVENUES - Additional Information (Details)	3 Months Ended		6 Months Ended
	Oct. 31, 2022 USD ($) customer	Oct. 31, 2021 USD ($) ft² customer	Oct. 31, 2022 USD ($) customer	Oct. 31, 2021 USD ($) ft² customer
REVENUES
Number of customers | customer	4	3	3	3
Customer outstanding receivables	$ 0	$ 0	$ 0	$ 0
Revenues	16,149,000	16,112,000	26,856,000	26,098,000
Customer A
REVENUES
Revenues	4,400,000	3,700,000	4,400,000	6,700,000
Customer B
REVENUES
Revenues	4,000,000	2,400,000	4,200,000	3,700,000
Customer C
REVENUES
Revenues	2,000,000	$ 1,700,000	$ 4,000,000	$ 3,400,000
Customer D
REVENUES
Revenues	$ 1,900,000
Warehouse and Office Buildings
REVENUES
Surface areas of land held | ft²		143,000		143,000
Warehouse and Office Buildings | Land sale revenue
REVENUES
Surface areas of land held | ft²		143,000		143,000

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