CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [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
Net income			7,318,433			7,318,433
Other comprehensive gain (loss)					2,260,019	2,260,019
Stock option exercises, net of surrenders		195,247		(56,961)		$ 138,286
Stock option exercises, net of surrenders (in shares)	19,084					22,163
Stock-based compensation expense		78,053				$ 78,053
Cash dividends			(4,089,320)			(4,089,320)
Ending balance at Dec. 31, 2019		47,131,034	5,879,409	(2,325,225)	482,814	51,168,032
Ending balance (in shares) at Dec. 31, 2019	5,530,001
Net income			6,460,631			6,460,631
Other comprehensive gain (loss)					1,187,052	1,187,052
Stock option exercises, net of surrenders		180,849		(63,805)		$ 117,044
Stock option exercises, net of surrenders (in shares)	15,535					19,298
Stock-based compensation expense		92,986				$ 92,986
Repurchase of common shares				(398,868)		(398,868)
Repurchase of common shares (in shares)	(25,067)
Cash dividends			(3,646,521)			(3,646,521)
Ending balance at Dec. 31, 2020		47,404,869	8,693,519	(2,787,898)	1,669,866	$ 54,980,356
Ending balance (in shares) at Dec. 31, 2020	5,520,469					5,520,469
Net income			6,744,865			$ 6,744,865
Other comprehensive gain (loss)					(3,802,836)	(3,802,836)
Stock option exercises, net of surrenders		237,383		(29,494)		$ 207,889
Stock option exercises, net of surrenders (in shares)	20,797					22,305
Stock-based compensation expense		103,033				$ 103,033
Cash dividends			(4,315,674)			(4,315,674)
Ending balance at Dec. 31, 2021		$ 47,745,285	$ 11,122,710	$ (2,817,392)	$ (2,132,970)	$ 53,917,633
Ending balance (in shares) at Dec. 31, 2021	5,541,266					5,541,266