Summary of Significant Accounting Policies - EPS (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share
Net income	$ 2,768,103	$ 2,534,766	$ 4,775,896	$ 2,476,167
Undistributed net income (loss)	1,728,580	1,512,637	1,686,750	(356,764)
Class K Common Stock
Earnings Per Share
Net income	1,815,882	1,693,748	3,157,834	1,733,290
Common Stock dividends declared and accumulated	690,893	691,713	2,057,627	1,976,596
Undistributed net income (loss)	$ 1,124,989	$ 1,002,035	$ 1,100,207	$ (243,306)
Net income (loss) per common share, basic (in dollars per share)	$ 0.46	$ 0.43	$ 0.80	$ 0.46
Net income (loss) per common share, diluted (in dollars per share)	$ 0.46	$ 0.43	$ 0.80	$ 0.46
Weighted average number of common shares outstanding - basic (in shares)	3,915,774	3,920,423	3,930,059	3,775,288
Weighted average number of common shares outstanding - diluted (in shares)	3,915,774	3,920,423	3,930,059	3,775,288
Shares held by the Company's independent directors			3,750
Class K-I Common Stock
Earnings Per Share
Net income	$ 618,844	$ 532,104	$ 1,065,864	$ 461,006
Common Stock dividends declared and accumulated	235,453	217,307	694,511	525,719
Undistributed net income (loss)	$ 383,391	$ 314,797	$ 371,353	$ (64,713)
Net income (loss) per common share, basic (in dollars per share)	$ 0.46	$ 0.43	$ 0.80	$ 0.46
Net income (loss) per common share, diluted (in dollars per share)	$ 0.46	$ 0.43	$ 0.80	$ 0.46
Weighted average number of common shares outstanding - basic (in shares)	1,334,480	1,231,632	1,326,513	1,004,120
Weighted average number of common shares outstanding - diluted (in shares)	1,334,480	1,231,632	1,326,513	1,004,120
Class K-T Common Stock
Earnings Per Share
Net income	$ 27,845	$ 25,777	$ 50,037	$ 24,316
Common Stock dividends declared and accumulated	10,594	10,526	32,604	27,731
Undistributed net income (loss)	$ 17,251	$ 15,251	$ 17,433	$ (3,415)
Net income (loss) per common share, basic (in dollars per share)	$ 0.46	$ 0.43	$ 0.80	$ 0.46
Net income (loss) per common share, diluted (in dollars per share)	$ 0.46	$ 0.43	$ 0.80	$ 0.46
Weighted average number of common shares outstanding - basic (in shares)	60,046	59,670	62,274	52,969
Weighted average number of common shares outstanding - diluted (in shares)	60,046	59,670	62,274	52,969
Class A Common Stock
Earnings Per Share
Net income	$ 269,620	$ 251,188	$ 467,168	$ 265,611
Common Stock dividends declared and accumulated	102,583	102,583	304,404	302,885
Undistributed net income (loss)	$ 167,037	$ 148,605	$ 162,764	$ (37,274)
Net income (loss) per common share, basic (in dollars per share)	$ 0.46	$ 0.43	$ 0.80	$ 0.46
Net income (loss) per common share, diluted (in dollars per share)	$ 0.46	$ 0.43	$ 0.80	$ 0.46
Weighted average number of common shares outstanding - basic (in shares)	581,410	581,410	581,410	578,347
Weighted average number of common shares outstanding - diluted (in shares)	581,410	581,410	581,410	578,347
Class B Common Stock
Earnings Per Share
Net income	$ 35,912	$ 31,949	$ 34,993	$ (8,056)
Undistributed net income (loss)	$ 35,912	$ 31,949	$ 34,993	$ (8,056)
Net income (loss) per common share, basic (in dollars per share)	$ 0.29	$ 0.26	$ 0.28	$ (0.06)
Net income (loss) per common share, diluted (in dollars per share)	$ 0.29	$ 0.26	$ 0.28	$ (0.06)
Weighted average number of common shares outstanding - basic (in shares)	125,000	125,000	125,000	125,000
Weighted average number of common shares outstanding - diluted (in shares)	125,000	125,000	125,000	125,000