Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2017	4,594,319
Balance at Dec. 31, 2017	$ 459,432	$ 466,025	$ 10,471,185	$ 11,396,642
Net income			1,059,862	1,059,862
Reclassification of accumulated other comprehensive income to retained earnings in accordance with ASU 2016-01 (See Note 7)		(466,025)	466,025
Balance (in shares) at Mar. 31, 2018	4,594,319
Balance at Mar. 31, 2018	$ 459,432		11,997,072	12,456,504
Balance (in shares) at Dec. 31, 2017	4,594,319
Balance at Dec. 31, 2017	$ 459,432	466,025	10,471,185	11,396,642
Net income				3,769,048
Balance (in shares) at Sep. 30, 2018	4,594,319
Balance at Sep. 30, 2018	$ 459,432		12,409,097	12,868,529
Balance (in shares) at Mar. 31, 2018	4,594,319
Balance at Mar. 31, 2018	$ 459,432		11,997,072	12,456,504
Net income			1,392,662	1,392,662
Dividends declared and paid			(2,291,294)	(2,291,294)
Dividends declared but not paid			(5,867)	(5,867)
Balance (in shares) at Jun. 30, 2018	4,594,319
Balance at Jun. 30, 2018	$ 459,432		11,092,573	11,552,005
Net income			1,316,524	1,316,524
Balance (in shares) at Sep. 30, 2018	4,594,319
Balance at Sep. 30, 2018	$ 459,432		12,409,097	12,868,529
Balance (in shares) at Dec. 31, 2018	4,594,319
Balance at Dec. 31, 2018	$ 459,432		10,465,506	10,924,938
Net income			1,222,694	1,222,694
Balance (in shares) at Mar. 31, 2019	4,594,319
Balance at Mar. 31, 2019	$ 459,432		11,688,200	12,147,632
Balance (in shares) at Dec. 31, 2018	4,594,319
Balance at Dec. 31, 2018	$ 459,432		10,465,506	10,924,938
Net income				3,371,375
Balance (in shares) at Sep. 30, 2019	4,594,319
Balance at Sep. 30, 2019	$ 459,432		11,310,005	11,769,437
Balance (in shares) at Mar. 31, 2019	4,594,319
Balance at Mar. 31, 2019	$ 459,432		11,688,200	12,147,632
Net income			1,078,810	1,078,810
Dividends declared and paid			(2,524,946)	(2,524,946)
Dividends declared but not paid			(1,930)	(1,930)
Balance (in shares) at Jun. 30, 2019	4,594,319
Balance at Jun. 30, 2019	$ 459,432		10,240,134	10,699,566
Net income			1,069,871	1,069,871
Balance (in shares) at Sep. 30, 2019	4,594,319
Balance at Sep. 30, 2019	$ 459,432		$ 11,310,005	$ 11,769,437