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OTHER INCOME - Lease Assignment Fee Income and Insurance Recoveries on Hurricane Casualty (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
item
Mar. 31, 2021
USD ($)
item
Mar. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Lease Assignment Fee Income        
Number of properties included in a lease split and assignment agreement | item 6 6 6  
Insurance Recoveries on Hurricane Casualty        
Insurance recovery proceeds due to casualty loss   $ 300,000    
Other income        
Lease Assignment Fee Income        
Fee income, lease assignment agreement $ 100,000      
Real Estate in Lake Charles, LA        
Insurance Recoveries on Hurricane Casualty        
Impairment due to casualty loss       $ 430,000
Amount of insurance deductible       250,000
Total claim amount submitted to insurance carrier $ 2,100,000 2,100,000 $ 2,100,000  
Losses in rental income     $ 129,000  
Receivable for insurance recoveries       430,000
Insurance recovery proceeds due to casualty loss   300,000   $ 150,000
Real Estate in Lake Charles, LA | Other income        
Insurance Recoveries on Hurricane Casualty        
Amount of advance from insurance carrier recognized as a gain in other income   $ 20,000