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Debt - Each borrowing under the Revolving Line of Credit (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument    
Principal Balance $ 482,089,565 $ 424,174,758
Carrying Value 480,462,652 422,280,515
Fair Value 478,397,706 419,407,194
Principal amount 373,228,429 $ 241,152,827
Revolving line of credit    
Debt Instrument    
Principal Balance 42,239,289  
Carrying Value 42,243,978  
Fair Value 42,597,991  
Principal amount 25,299,713  
Revolving line of credit | 870 Santa Cruz LLC    
Debt Instrument    
Principal Balance 14,743,638  
Carrying Value 14,812,462  
Fair Value 14,868,662  
Principal amount 10,324,046  
Revolving line of credit | D-G Acquisition #6, LLC and D-G Quimisa, LLC    
Debt Instrument    
Principal Balance 8,355,853  
Carrying Value 8,379,936  
Fair Value 8,428,907  
Principal amount 5,500,000  
Revolving line of credit | 606 fayetteville LLC and 401 E, Lakewood LLC    
Debt Instrument    
Principal Balance 16,770,042  
Carrying Value 16,865,626  
Fair Value 16,910,927  
Principal amount 7,816,840  
Revolving line of credit | The Lux Washington, LLC    
Debt Instrument    
Principal Balance 2,369,756  
Carrying Value 2,185,954  
Fair Value 2,389,495  
Principal amount $ 1,658,827