Unaudited Quarterly Financial Information (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Unaudited Quarterly Financial Information
Total revenue	$ 3,594	$ 3,424,000	$ 3,585,000	$ 3,282,000	$ 3,268,000	$ 2,938,000	$ 2,610,000	$ 2,719,000	$ 13,884,888	$ 11,535,664	$ 11,704,624
Operating income	(106)	264,000	424,000	1,162,000	295,000	411,000	1,019,000	589,000	1,743,588	2,314,044	2,613,588
Net (loss) income before income taxes	(451)	(79,000)	85,000	827,000	(4,984,000)	83,000	696,000	(337,000)
Net income (loss)	$ (324)	$ (79,000)	$ 85,000	$ 827,000	$ (5,906,000)	$ 83,000	$ 696,000	$ (255,000)	$ 509,465	$ (5,381,946)	$ (378,065)
Net income (loss) per common share
Basic	$ (0.01)	$ 0	$ 0	$ 0.04	$ (0.26)	$ 0.00	$ 0.03	$ (0.01)	$ 0.02	$ (0.24)	$ (0.02)
Earnings per share, diluted	$ (0.01)	$ 0	$ 0	$ 0.04	$ (0.26)	$ 0.00	$ 0.03	$ (0.01)	$ 0.02	$ (0.24)	$ (0.02)