Quarterly report pursuant to Section 13 or 15(d)

MORTGAGES AND NOTES PAYABLE - Schedule of mortgages (Details)

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MORTGAGES AND NOTES PAYABLE - Schedule of mortgages (Details) - USD ($)
Sep. 30, 2022
Dec. 31, 2021
Short-Term Debt [Line Items]    
Total mortgages payable $ 26,494,000  
Mortgages    
Short-Term Debt [Line Items]    
Total mortgages payable 20,703,000 $ 18,214,000
Less: Mortgages payable, current (1,485,000) (1,400,000)
Mortgages payable, less current portion 19,218,000 16,814,000
Bank of New England – New Bedford, MA and Middleboro, MA properties | Mortgages    
Short-Term Debt [Line Items]    
Total mortgages payable 12,231,000 12,499,000
Bank of New England – Wilmington, DE property | Mortgages    
Short-Term Debt [Line Items]    
Total mortgages payable 1,374,000 1,463,000
DuQuoin State Bank – Anna, IL and Harrisburg, IL properties | Mortgages    
Short-Term Debt [Line Items]    
Total mortgages payable 759,000 778,000
DuQuoin State Bank – Metropolis, IL property | Mortgages    
Short-Term Debt [Line Items]    
Total mortgages payable 2,541,000 2,658,000
Du Quoin State Bank - Mt. Vernon, IL property | Mortgages    
Short-Term Debt [Line Items]    
Total mortgages payable 2,990,000 0
Less: Mortgages payable, current (66,000)  
South Porte Bank – Mt. Vernon, IL property | Mortgages    
Short-Term Debt [Line Items]    
Total mortgages payable $ 808,000 $ 816,000