Summary of Significant Accounting Policies - EPS (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share
Undistributed net income (loss)	$ (46,262)	$ 505,148	$ (4,854,609)	$ (823,740)
Net income (loss)	753,582	970,167	(2,646,339)	308,361
Class K Common Stock
Earnings Per Share
Undistributed net income (loss)	(32,922)	345,553	(3,442,620)	(574,376)
Common Stock dividends declared and accumulated	584,848	331,039	1,610,617	828,495
Net income (loss)	$ 551,926	$ 676,592	$ (1,832,003)	$ 254,119
Net income (loss) per common share - basic and diluted (in dollars per share)	$ 0.17	$ 0.31	$ (0.57)	$ 0.14
Weighted average number of common shares outstanding, basic and diluted (in shares)	3,323,827	2,188,750	3,217,836	1,846,052
Class K-I Common Stock
Earnings Per Share
Undistributed net income (loss)	$ (6,304)	$ 53,076	$ (652,273)	$ (54,138)
Common Stock dividends declared and accumulated	111,991	50,849	305,563	78,107
Net income (loss)	$ 105,687	$ 103,925	$ (346,710)	$ 23,969
Net income (loss) per common share - basic and diluted (in dollars per share)	$ 0.17	$ 0.31	$ (0.57)	$ 0.14
Weighted average number of common shares outstanding, basic and diluted (in shares)	636,468	336,183	609,683	174,002
Class K-T Common Stock
Earnings Per Share
Undistributed net income (loss)	$ (475)	$ 1,939	$ (51,033)	$ (1,708)
Common Stock dividends declared and accumulated	8,444	1,857	23,826	2,475
Net income (loss)	$ 7,969	$ 3,796	$ (27,207)	$ 767
Net income (loss) per common share - basic and diluted (in dollars per share)	$ 0.17	$ 0.31	$ (0.57)	$ 0.14
Weighted average number of common shares outstanding, basic and diluted (in shares)	47,989	12,280	47,700	5,489
Class A Common Stock
Earnings Per Share
Undistributed net income (loss)	$ (5,323)	$ 84,845	$ (574,951)	$ (154,626)
Common Stock dividends declared and accumulated	94,561	81,274	268,264	223,024
Net income (loss)	$ 89,238	$ 166,119	$ (306,687)	$ 68,398
Net income (loss) per common share - basic and diluted (in dollars per share)	$ 0.17	$ 0.31	$ (0.57)	$ 0.14
Weighted average number of common shares outstanding, basic and diluted (in shares)	537,410	537,410	537,410	496,970
Class B Common Stock
Earnings Per Share
Undistributed net income (loss)	$ (1,238)	$ 19,735	$ (133,732)	$ (38,892)
Net income (loss)	$ (1,238)	$ 19,735	$ (133,732)	$ (38,892)
Net income (loss) per common share - basic and diluted (in dollars per share)	$ (0.01)	$ 0.16	$ (1.07)	$ (0.31)
Weighted average number of common shares outstanding, basic and diluted (in shares)	125,000	125,000	125,000	125,000