Annual report pursuant to Section 13 and 15(d)

MORTGAGES AND NOTES PAYABLE - Schedule of Mortgage and Accrued Interest (Details)

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MORTGAGES AND NOTES PAYABLE - Schedule of Mortgage and Accrued Interest (Details) - Mortgages - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Short-term Debt [Line Items]    
Total mortgages payable $ 20,519,000 $ 18,214,000
Less: Mortgages payable, current portion (1,491,000) (1,400,000)
Mortgages payable, net of current 19,028,000 16,814,000
Bank of New England New Bedford, MA and Middleborough, MA properties    
Short-term Debt [Line Items]    
Total mortgages payable 12,141,000 12,499,000
Less: Mortgages payable, current portion (382,000) (358,000)
Bank of New England Wilmington, DE property    
Short-term Debt [Line Items]    
Total mortgages payable 1,345,000 1,463,000
Less: Mortgages payable, current portion (126,000) (130,000)
DuQuoin State Bank Anna, IL and Harrisburg, IL properties    
Short-term Debt [Line Items]    
Total mortgages payable 750,000 778,000
Less: Mortgages payable, current portion (36,000) (33,000)
DuQuoin State Bank Metropolis, IL property    
Short-term Debt [Line Items]    
Total mortgages payable 2,508,000 2,658,000
Less: Mortgages payable, current portion (77,000) (73,000)
DuQuoin State Bank Mt. Vernon, IL property    
Short-term Debt [Line Items]    
Total mortgages payable 2,974,000 0
Less: Mortgages payable, current portion (68,000)  
South Porte Bank Mt. Vernon, IL property    
Short-term Debt [Line Items]    
Total mortgages payable $ 801,000 $ 816,000