CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($)	Redeemable Preferred Stock	Common Stock	Retained Earnings	Total
Beginning balance, shares at Dec. 31, 2018	4,662,768	4,964,529
Beginning balance, amount at Dec. 31, 2018	$ 18,319,102	$ 8,512,489	$ 20,728,677	$ 47,560,268
Preferred stock dividends accrued	256,452		(256,452)	0
Net income			426,476	426,476
Ending balance, shares at Mar. 31, 2019	4,662,768	4,964,529
Ending balance, amount at Mar. 31, 2019	$ 18,575,554	$ 8,512,489	20,898,701	47,986,744
Beginning balance, shares at Dec. 31, 2018	4,662,768	4,964,529
Beginning balance, amount at Dec. 31, 2018	$ 18,319,102	$ 8,512,489	20,728,677	47,560,268
Net income				1,638,587
Ending balance, shares at Sep. 30, 2019	4,662,768	4,964,529
Ending balance, amount at Sep. 30, 2019	$ 19,088,458	$ 8,512,489	21,597,908	49,198,855
Beginning balance, shares at Mar. 31, 2019	4,662,768	4,964,529
Beginning balance, amount at Mar. 31, 2019	$ 18,575,554	$ 8,512,489	20,898,701	47,986,744
Preferred stock dividends accrued	256,452		(256,452)	0
Net income			359,911	359,911
Ending balance, shares at Jun. 30, 2019	4,662,768	4,964,529
Ending balance, amount at Jun. 30, 2019	$ 18,832,006	$ 8,512,489	21,002,160	48,346,655
Preferred stock dividends accrued	256,452		(256,452)	0
Net income			852,200	852,200
Ending balance, shares at Sep. 30, 2019	4,662,768	4,964,529
Ending balance, amount at Sep. 30, 2019	$ 19,088,458	$ 8,512,489	21,597,908	49,198,855
Beginning balance, shares at Dec. 31, 2019	4,662,768	4,964,529
Beginning balance, amount at Dec. 31, 2019	$ 18,319,102	$ 8,512,489	22,213,515	49,045,106
Preferred stock dividends accrued	256,452		(256,452)	0
Net income			787,082	787,082
Ending balance, shares at Mar. 31, 2020	4,662,768	4,964,529
Ending balance, amount at Mar. 31, 2020	$ 18,575,554	$ 8,512,489	22,744,145	49,832,188
Beginning balance, shares at Dec. 31, 2019	4,662,768	4,964,529
Beginning balance, amount at Dec. 31, 2019	$ 18,319,102	$ 8,512,489	22,213,515	49,045,106
Net income				2,304,302
Ending balance, shares at Sep. 30, 2020	4,662,768	4,964,529
Ending balance, amount at Sep. 30, 2020	$ 19,088,458	$ 8,512,489	23,748,461	51,349,408
Beginning balance, shares at Mar. 31, 2020	4,662,768	4,964,529
Beginning balance, amount at Mar. 31, 2020	$ 18,575,554	$ 8,512,489	22,744,145	49,832,188
Preferred stock dividends accrued	256,452		(256,452)	0
Net income			620,421	620,421
Ending balance, shares at Jun. 30, 2020	4,662,768	4,964,529
Ending balance, amount at Jun. 30, 2020	$ 18,832,006	$ 8,512,489	23,108,114	50,452,609
Preferred stock dividends accrued	256,452		(256,452)	0
Net income			896,799	896,799
Ending balance, shares at Sep. 30, 2020	4,662,768	4,964,529
Ending balance, amount at Sep. 30, 2020	$ 19,088,458	$ 8,512,489	$ 23,748,461	$ 51,349,408