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INFORMATION ABOUT THE COMPANY'S OPERATIONS IN DIFFERENT INDUSTRY SEGMENTS (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
Apr. 30, 2020
Segment Reporting Information [Line Items]          
Revenues $ 7,864,000 $ 5,287,000 $ 21,326,000 $ 14,014,000  
Net income (loss) 2,093,000 338,000 3,484,000 (2,027,000)  
Provision (benefit) for income taxes 710,000 396,000 1,175,000 (360,000)  
Interest expense (income), net (b) 21,000 (58,000) 27,000 (323,000)  
Depreciation 154,000 118,000 424,000 381,000  
EBITDA (c) 2,978,000 794,000 5,110,000 (2,329,000)  
Capital expenditures 3,000 13,000 3,000 18,000  
TOTAL ASSETS 95,892,000 97,314,000 $ 95,892,000 97,314,000 $ 96,666,000
Number of business segment     1    
Land Development          
Segment Reporting Information [Line Items]          
Revenues 6,531,000 4,508,000 $ 19,376,000 12,553,000  
Net income (loss) 2,284,000 2,469,000 4,684,000 1,684,000  
Provision (benefit) for income taxes 483,000 101,000 810,000 (125,000)  
Interest expense (income), net (b) 20,000 (5,000) 30,000 (19,000)  
Depreciation 17,000 30,000 40,000 13,000  
EBITDA (c) 2,804,000 2,595,000 5,564,000 1,553,000  
Capital expenditures       5,000  
TOTAL ASSETS 76,580,000 68,259,000 76,580,000 68,259,000  
Homebuilding          
Segment Reporting Information [Line Items]          
Revenues 1,262,000   1,464,000    
Net income (loss) 35,000   (116,000)    
Provision (benefit) for income taxes 7,000   (44,000)    
EBITDA (c) 42,000   (160,000)    
Capital expenditures 3,000   3,000    
TOTAL ASSETS 1,916,000   1,916,000    
Corporate          
Segment Reporting Information [Line Items]          
Revenues 71,000 779,000 486,000 1,461,000  
Net income (loss) (226,000) (2,131,000) (1,084,000) (3,711,000)  
Provision (benefit) for income taxes 220,000 295,000 409,000 (235,000)  
Interest expense (income), net (b) 1,000 (53,000) (3,000) (304,000)  
Depreciation 137,000 88,000 384,000 368,000  
EBITDA (c) 132,000 (1,801,000) (294,000) (3,882,000)  
Capital expenditures   13,000   13,000  
TOTAL ASSETS $ 17,498,000 $ 29,055,000 $ 17,498,000 $ 29,055,000