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Schedule III - Real Estate and Related Depreciation (Parenthetical) (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Real Estate And Accumulated Depreciation [Line Items]    
Principal balance outstanding $ 18,847,475 $ 19,338,556
Line of credit, outstanding borrowings 5,144,000 4,914,000
Revolving Line of Credit    
Real Estate And Accumulated Depreciation [Line Items]    
Line of credit, outstanding borrowings $ 5,144,000 $ 4,914,000