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DEBT - Narrative (Details)
9 Months Ended
Mar. 31, 2021
USD ($)
Mar. 29, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
lease
Sep. 30, 2021
lease
Sep. 30, 2021
Sep. 30, 2021
property
Jul. 09, 2021
USD ($)
Dec. 31, 2020
USD ($)
property
Apr. 20, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                      
Debt instrument, fair value disclosure     $ 183,304,467           $ 177,573,106    
Number of real estate properties, held-for-sale       3 0   0   2    
Outstanding balance of unsecured credit facility     0           $ 6,000,000    
Repayments of unsecured credit facility     12,000,000 $ 6,000,000              
Unamortized deferred financing costs     0           21,724    
Maximum leverage ratio           0.55          
Credit Facility | Unsecured Credit Facility                      
Debt Instrument [Line Items]                      
Repayments of unsecured credit facility $ 6,000,000                    
Minimum | Credit Facility | Unsecured Credit Facility                      
Debt Instrument [Line Items]                      
Line of credit facility, interest rate during period   4.75%                  
Prime Rate | Credit Facility | Unsecured Credit Facility                      
Debt Instrument [Line Items]                      
Debt instrument, basis spread on variable rate   100.00%                  
New Credit Facility | Line of Credit                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity   $ 22,000,000                  
Proceeds from credit facility $ 6,000,000                    
Payments of debt issuance costs   $ 77,000                  
Unused commitment fee percentage   0.15%                  
Minimum debt service coverage ratio   125.00%                  
Minimum tangible net asset value   $ 120,000,000                  
New Credit Facility | Line of Credit | Revolving Credit Facility, Real Estate Acquisitions                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity   17,000,000                  
New Credit Facility | Line of Credit | Revolving Credit Facility, Working Capital                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity   5,000,000           $ 5,000,000      
New Credit Facility | Credit Facility                      
Debt Instrument [Line Items]                      
Unamortized deferred financing costs     $ 97,092                
Loans, Mature on October 15, 2021 | Line of Credit | Unsecured Credit Facility                      
Debt Instrument [Line Items]                      
Outstanding balance of unsecured credit facility                 $ 6,000,000    
Revolving Line of Credit Due by September 30, 2021 | Line of Credit                      
Debt Instrument [Line Items]                      
Repayments of unsecured credit facility   $ 6,000,000                  
Short-term Convertible Notes Payable                      
Debt Instrument [Line Items]                      
Debt instrument, face amount                     $ 4,800,000
Short-term Other Notes Payable | Loan Agreement and Promissory Note, Paycheck Protection Program, CARES Act                      
Debt Instrument [Line Items]                      
Debt instrument, face amount                   $ 517,000