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Notes Payable and Accrued Interest (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Payable and Accrued Interest [Abstract]  
Notes Payable and Accrued Interest
At June 30, 2018 and December 31, 2017, the Company's notes payable and accrued interest consisted of the following:

  
June 30,
2018
  
December 31,
2017
 
Credit Facility:
      
   Principal
 
$
137,500,000
  
$
134,000,000
 
   Unamortized debt issuance costs
  
(1,483,500
)
  
(2,216,000
)
   Accrued interest
  
223,000
   
278,900
 
Special purpose financing:
        
   Principal
  
11,384,800
   
13,511,900
 
   Accrued interest
  
18,200
   
23,400
 
  
$
147,642,500
  
$
145,598,200