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Notes Payable and Accrued Interest (Tables)
6 Months Ended
Jun. 30, 2017
Notes Payable and Accrued Interest [Abstract]  
Notes payable and accrued interest
At June 30, 2017 and December 31, 2016, the Company's notes payable and accrued interest consisted of the following:

  
June 30,
2017
  
December 31,
2016
 
Credit Facility:
      
   Principal
 
$
133,300,000
  
$
110,100,000
 
   Unamortized debt issuance costs
  
(1,634,200
)
  
(1,999,900
)
   Accrued interest
  
153,200
   
83,600
 
SPE Financing:
        
   Principal
  
15,589,700
   
17,623,600
 
   Accrued interest
  
25,000
   
30,600
 
  
$
147,433,700
  
$
125,837,900