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Summary of Significant Accounting Policies (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Assets:    
Cash and money market accounts $ 6,949,937 $ 6,293,293
Bank certificates of deposit 996,495 2,480,753
Total 7,946,432 8,774,046
Liabilities:    
Bank debt (9,497,486)  
Interest rate swaps   (58,526)
Fair Value, Inputs, Level 1 [Member]    
Assets:    
Cash and money market accounts 6,949,937 6,293,293
Bank certificates of deposit
Total 6,949,937 6,293,293
Liabilities:    
Bank debt  
Interest rate swaps  
Fair Value, Inputs, Level 2 [Member]    
Assets:    
Cash and money market accounts
Bank certificates of deposit 996,495 2,480,753
Total 996,495 2,480,753
Liabilities:    
Bank debt (9,497,486)  
Interest rate swaps   (58,526)
Fair Value, Inputs, Level 3 [Member]    
Assets:    
Cash and money market accounts
Bank certificates of deposit
Total
Liabilities:    
Bank debt  
Interest rate swaps