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Loan Payable Under Credit Agreement (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 02, 2019
Jan. 31, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Mar. 06, 2015
Loan Payable Under Credit Agreement (Textual)                
Interest expense     $ 1,051,120 $ 1,021,984 $ 2,262,747 $ 2,203,977    
Description of credit facility   Upon 30 days' prior written notice from the applicable noteholder and the Company can prepay principal and interest at any time without penalty.            
Outstanding balance credit agreement     25,733,626   25,733,626      
Unamortized issuance costs     $ 73,676   $ 73,676   $ 281,138  
Percentage of borrowing     100.00%   100.00%      
Credit Agreement [Member]                
Loan Payable Under Credit Agreement (Textual)                
Borrowed from lender     $ 32,500,000   $ 32,500,000     $ 32,500,000
Interest expense     $ 763,910 $ 735,619 $ 1,665,440 $ 1,689,529    
Description of credit facility The Commitment Termination Date was extended to February 28, 2021.              
Interest rate 11.00%   11.18%   11.18%