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Derivative Instruments (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Change in value of Swaps $ 43,000 $ 0 $ 451,400 $ 0
Other items (20,800) 0 (22,100) 0
Included in interest expense 22,200 0 429,300 0
Change in value of hedged Swaps $ (1,287,900) $ 0 $ (1,832,700) $ 0