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REVENUES - Additional Information (Details)	12 Months Ended
	Apr. 30, 2023 USD ($) ft² customer	Apr. 30, 2022 USD ($) customer	Jan. 31, 2023 a
REVENUES
Number of customers | customer	3	4
Customer outstanding receivables	$ 0
Revenues	48,676,000	$ 58,926,000
Customer A
REVENUES
Revenues	7,763,000	10,982,000
Customer B
REVENUES
Revenues	6,810,000	7,107,000
Customer C
REVENUES
Revenues	$ 6,182,000	6,750,000
Customer D
REVENUES
Revenues		$ 6,445,000
Minerals and mineral rights
REVENUES
Surface acres of land held | a			147
Land sale revenue
REVENUES
Number of customers | customer	4	4
New Mexico | Minerals and mineral rights
REVENUES
Surface acres of land held | a			55,000
Retail Building | New Mexico
REVENUES
Surface acres of land held | ft²	4,338
Warehouse and Office Buildings
REVENUES
Surface acres of land held | ft²	143,000

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