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Quarterly Financial Information (Schedule of Quarterly Financial Information (Unaudited)) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 10,261,534 $ 9,250,689 $ 9,598,177 $ 8,330,734 $ 9,305,553 $ 6,935,439 $ 9,417,443 $ 8,729,860 $ 37,441,134 $ 34,388,295 $ 29,344,894
Operating income (loss) (1,745,946) (1,208,686) (1,580,962) (1,846,001) (3,394,390) (3,196,436) (1,373,424) (1,323,932) (6,381,595) (9,288,182) (11,172,996)
Net income (loss) attributable to common shareholders $ (883,776) $ (481,737) $ (918,275) $ (1,055,620) $ (960,706) $ (1,953,668) $ (549,507) $ (73,878) $ (3,339,408) $ (3,537,759) $ (6,963,068)
Earnings per share attributable to common shareholders                      
Basic (in USD per share) $ (0.06) $ (0.03) $ (0.06) $ (0.07) $ (0.06) $ (0.13) $ (0.04) $ 0 $ (0.22) $ (0.23) $ (0.45)
Diluted (in USD per share) $ (0.06) $ (0.03) $ (0.06) $ (0.07) $ (0.06) $ (0.13) $ (0.04) $ 0 $ (0.22) $ (0.23) $ (0.45)