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Note Payable and Revolving Line of Credit- Additional Information (Details) - USD ($)
12 Months Ended
Dec. 20, 2018
Jun. 24, 2016
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Borrowing principal amount     $ 18,847,475 $ 19,338,556
Loan procurement costs   $ 646,246 458,299 498,769
Amortization expense     199,797 200,819
Note payable, net book value     25,900,000  
Line of credit, outstanding borrowings     5,144,000 4,914,000
Revolving Line of Credit        
Debt Instrument [Line Items]        
Amortization expense     159,327 159,327
Line of credit, issuance costs     477,981  
Line of credit, outstanding borrowings     5,144,000 4,914,000
Promissory Note        
Debt Instrument [Line Items]        
Borrowing principal amount   $ 20,000,000    
Debt instrument interest rate   4.192%    
Debt instrument maturity date   Jul. 01, 2036    
Amortization expense     $ 40,470 $ 41,492
Promissory Note | Revolving Line of Credit        
Debt Instrument [Line Items]        
Borrowing principal amount $ 10,000,000      
Debt instrument maturity date Dec. 20, 2021      
Promissory Note | Revolving Line of Credit | One Month London Inter-Bank Offered Rate        
Debt Instrument [Line Items]        
Debt instrument interest rate 3.00%