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LEASED PROPERTY (Details)
3 Months Ended 9 Months Ended
Mar. 15, 2019
USD ($)
Mar. 01, 2019
USD ($)
Jan. 31, 2020
USD ($)
Jan. 31, 2020
USD ($)
Apr. 30, 2019
USD ($)
Feb. 15, 2019
ft²
LEASED PROPERTY            
Square feet (in area) | ft²           23,924
Monthly base rate   $ 11,500        
Number of months for which monthly base rate is fixed 62 months          
Capital Leases            
2020     $ 37,500 $ 37,500    
2021     154,000 154,000    
2022     166,000 166,000    
2023     178,000 178,000    
2024     124,000 124,000    
Total     659,500 659,500    
Leased property by asset category            
Leased property, gross     1,265,000 1,265,000 $ 1,265,000  
Less accumulated depreciation     (702,000) (702,000) (659,000)  
Net leased property     563,000 563,000 606,000  
Depreciation resulting from the leased property     5,000 15,000    
Land.            
Leased property by asset category            
Leased property, gross     265,000 265,000 265,000  
Buildings and Improvements.            
Leased property by asset category            
Leased property, gross     $ 1,000,000 $ 1,000,000 $ 1,000,000  
Minimum            
LEASED PROPERTY            
Monthly base rate $ 11,500          
Maximum            
LEASED PROPERTY            
Monthly base rate $ 15,500