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OTHER INCOME - Lease Assignment Fee Income and Insurance Recoveries on Hurricane Casualty (Details)
 1 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
item
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Lease Assignment Fee Income      
Number of properties included in a lease split and assignment agreement | item 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   2,150,000  
Losses in rental income   216,000  
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