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Promissory Notes - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2021
Feb. 28, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Debt Instrument [Line Items]              
Amortization of debt issuance costs         $ 94,600 $ 106,210  
Payments of debt issuance costs         39,991 564,857  
Secured debt     $ 26,765,781   26,765,781   $ 28,356,571
Promissory Notes              
Debt Instrument [Line Items]              
Amortization of debt issuance costs     30,700 $ 28,400 94,600 106,200  
Payments of debt issuance costs         40,000 $ 564,900  
Long-term debt     26,765,781   26,765,781   $ 29,456,571
Secured debt     14,600,000   14,600,000    
Promissory Notes | Nonrecourse              
Debt Instrument [Line Items]              
Secured debt     12,800,000   12,800,000    
Promissory Notes | DC/Tampa/Huntsville Loan              
Debt Instrument [Line Items]              
Secured debt     11,200,000   11,200,000    
Promissory Notes | Tampa Sherwin Williams Property              
Debt Instrument [Line Items]              
Secured debt     1,300,000   1,300,000    
Promissory Notes | Irby Property              
Debt Instrument [Line Items]              
Secured debt     900,000   900,000    
Promissory Notes | GSA Manteo NC Property              
Debt Instrument [Line Items]              
Secured debt     1,300,000   1,300,000    
Promissory Notes | Promissory Notes Required 1.25 DSCR              
Debt Instrument [Line Items]              
Long-term debt     $ 24,000,000.0   $ 24,000,000.0    
Debt service coverage ratios     1.25%   1.25%    
Promissory Notes | Promissory Notes Required 1.20 DSCR              
Debt Instrument [Line Items]              
Long-term debt     $ 1,300,000   $ 1,300,000    
Debt service coverage ratios     1.20%   1.20%    
Promissory Notes | Promissory Notes Required 1.15 DSCR              
Debt Instrument [Line Items]              
Long-term debt     $ 900,000   $ 900,000    
Debt service coverage ratios     1.15%   1.15%    
Promissory Notes | Promissory Notes Required 1.30 DSCR              
Debt Instrument [Line Items]              
Long-term debt     $ 1,300,000   $ 1,300,000    
Debt service coverage ratios     1.30%   1.30%    
Promissory Notes | Bayport Loans              
Debt Instrument [Line Items]              
Interest rate 4.25% 3.50%