CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($)	Common Stock [Member]	Additional Paid in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning Balance at Dec. 31, 2018		$ 46,857,734	$ 2,650,296	$ (2,268,264)	$ (1,777,205)	$ 45,462,561
Beginning Balance (in shares) at Dec. 31, 2018	5,510,917
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			1,689,264			1,689,264
Other comprehensive income (loss)					991,936	991,936
Stock option exercises		51,265				51,265
Stock option exercises (in shares)	5,808
Stock-based compensation expense		18,881				18,881
Cash dividends			(882,676)			(882,676)
Ending Balance at Mar. 31, 2019		46,927,880	3,456,884	(2,268,264)	(785,269)	47,331,231
Ending Balance (in shares) at Mar. 31, 2019	5,516,725
Beginning Balance at Dec. 31, 2018		46,857,734	2,650,296	(2,268,264)	(1,777,205)	45,462,561
Beginning Balance (in shares) at Dec. 31, 2018	5,510,917
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income						5,544,902
Other comprehensive income (loss)						2,321,352
Ending Balance at Sep. 30, 2019		47,110,889	4,990,680	(2,325,225)	544,147	50,320,491
Ending Balance (in shares) at Sep. 30, 2019	5,530,001
Beginning Balance at Mar. 31, 2019		46,927,880	3,456,884	(2,268,264)	(785,269)	47,331,231
Beginning Balance (in shares) at Mar. 31, 2019	5,516,725
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			1,840,847			1,840,847
Other comprehensive income (loss)					1,038,565	1,038,565
Stock option exercises		94,977		(45,843)		49,134
Stock option exercises (in shares)	8,553
Stock-based compensation expense		18,882				18,882
Cash dividends			(884,044)			(884,044)
Ending Balance at Jun. 30, 2019		47,041,739	4,413,687	(2,314,107)	253,296	49,394,615
Ending Balance (in shares) at Jun. 30, 2019	5,525,278
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			2,014,791			2,014,791
Other comprehensive income (loss)					290,851	290,851
Stock option exercises		49,005		(11,118)		37,887
Stock option exercises (in shares)	4,723
Stock-based compensation expense		20,145				20,145
Cash dividends			(1,437,798)			(1,437,798)
Ending Balance at Sep. 30, 2019		47,110,889	4,990,680	(2,325,225)	544,147	50,320,491
Ending Balance (in shares) at Sep. 30, 2019	5,530,001
Beginning Balance at Dec. 31, 2019		47,131,034	5,879,409	(2,325,225)	482,814	$ 51,168,032
Beginning Balance (in shares) at Dec. 31, 2019	5,530,001					5,530,001
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			1,521,131			$ 1,521,131
Other comprehensive income (loss)					601,016	601,016
Stock option exercises		4,489				4,489
Stock option exercises (in shares)	362
Stock-based compensation expense		16,418				16,418
Cash dividends			(884,859)			(884,859)
Ending Balance at Mar. 31, 2020		47,151,941	6,515,681	(2,325,225)	1,083,830	52,426,227
Ending Balance (in shares) at Mar. 31, 2020	5,530,363
Beginning Balance at Dec. 31, 2019		47,131,034	5,879,409	(2,325,225)	482,814	$ 51,168,032
Beginning Balance (in shares) at Dec. 31, 2019	5,530,001					5,530,001
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income						$ 4,725,425
Other comprehensive income (loss)						1,567,396
Ending Balance at Sep. 30, 2020		47,370,912	7,896,793	(2,787,898)	2,050,210	$ 54,530,017
Ending Balance (in shares) at Sep. 30, 2020	5,519,259					5,519,259
Beginning Balance at Mar. 31, 2020		47,151,941	6,515,681	(2,325,225)	1,083,830	$ 52,426,227
Beginning Balance (in shares) at Mar. 31, 2020	5,530,363
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			1,501,023			1,501,023
Other comprehensive income (loss)					970,698	970,698
Stock option exercises		108,757		(41,697)		67,060
Stock option exercises (in shares)	9,619
Stock-based compensation expense		29,305				29,305
Repurchase of common shares				(148,550)		(148,550)
Repurchase of common shares (in shares)	(9,300)
Cash dividends			(884,908)			(884,908)
Ending Balance at Jun. 30, 2020		47,290,003	7,131,796	(2,515,472)	2,054,528	53,960,855
Ending Balance (in shares) at Jun. 30, 2020	5,530,682
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			1,703,271			1,703,271
Other comprehensive income (loss)					(4,318)	(4,318)
Stock option exercises		56,496		$ (22,108)		34,388
Stock option exercises (in shares)	4,344
Stock-based compensation expense		24,413				$ 24,413
Repurchase of common shares (in shares)	(15,767)			(250,318)		(250,318)
Cash dividends			(938,274)			$ (938,274)
Ending Balance at Sep. 30, 2020		$ 47,370,912	$ 7,896,793	$ (2,787,898)	$ 2,050,210	$ 54,530,017
Ending Balance (in shares) at Sep. 30, 2020	5,519,259					5,519,259