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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