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Notes Payable and Accrued Interest (Tables)
3 Months Ended
Mar. 31, 2020
Notes Payable [Abstract]  
Notes payable and accrued interest
   

March 31,

2020

   

December 31,

2019

 
MUFG Credit Facility:            
   Principal   $ 83,333,900     $ 84,084,100  
   Unamortized debt issuance costs     (2,979,100 )     (3,084,200 )
   Accrued interest     710,700       376,200  
Nord Loans:                
   Principal     30,250,600       30,914,500  
   Unamortized debt issuance costs     (627,000 )     (741,500 )
   Accrued interest     268,700       89,300  
    $ 110,957,800     $ 111,638,400