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Notes Payable and Accrued Interest (Tables)
3 Months Ended
Mar. 31, 2018
Notes Payable and Accrued Interest [Abstract]  
Notes payable and accrued interest
At March 31, 2018 and December 31, 2017, the Company's notes payable and accrued interest consisted of the following:

  
March 31,
2018
  
December 31,
2017
 
Credit Facility:
      
   Principal
 
$
123,000,000
  
$
134,000,000
 
   Unamortized debt issuance costs
  
(1,817,200
)
  
(2,216,000
)
   Accrued interest
  
111,100
   
278,900
 
Special purpose financing:
        
   Principal
  
12,452,600
   
13,511,900
 
   Accrued interest
  
21,600
   
23,400
 
  
$
133,768,100
  
$
145,598,200