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REVENUES - Additional Information (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2022 USD ($) ft² customer | Jan. 31, 2021 USD ($) customer | Jan. 31, 2022 USD ($) ft² customer | Jan. 31, 2021 USD ($) customer | Oct. 31, 2021 ft² | Apr. 30, 2021 ft²
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of customers | customer | 2 | 2 | 3 | 4 |  |
Customer outstanding receivables | $ | $ 0 |  | $ 0 |  |  |
Revenues | $ | $ 9,816,000 | $ 7,864,000 | $ 36,559,000 | $ 21,326,000 |  |
Area of land sold | ft² | 143,000 |  | 143,000 |  |  |
Surface areas of land held | ft² | 143,000 |  | 143,000 |  |  |
Customer A |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Revenues | $ | $ 1,458,000 | 2,034,000 | $ 3,699,000 | 2,490,000 |  |
Customer B |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Revenues | $ | $ 4,068,000 | $ 2,427,000 | 4,844,000 | 3,011,000 |  |
Customer C |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Revenues | $ |  |  | $ 10,754,000 | 4,596,000 |  |
Customer D |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Revenues | $ |  |  |  | $ 7,244,000 |  |
Land sale revenue |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of customers | customer | 2 | 2 | 3 | 4 |  |
Florida |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Area of land sold | ft² | 14,000 |  | 14,000 |  |  |
Warehouse and Office Buildings |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Area of land sold | ft² |  |  |  |  | 143,000 |
Surface areas of land held | ft² |  |  |  |  |  | 143,000
Warehouse and Office Buildings | Florida |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Area of land sold | ft² | 143,000 |  | 143,000 |  |  |

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