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, value 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
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 (in shares)	(25,067)
Repurchase of common shares				(398,868)		(398,868)
Cash dividends			(3,646,521)			(3,646,521)
Ending balance, value 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
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, value 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
Net income			6,655,140			$ 6,655,140
Other comprehensive gain (loss)					(18,269,511)	(18,269,511)
Stock option exercises, net of surrenders		161,731				$ 161,731
Stock option exercises, net of surrenders (in shares)	11,085					11,085
Stock-based compensation expense		121,673				$ 121,673
Cash dividends			(3,775,279)			(3,775,279)
Ending balance, value at Dec. 31, 2022		$ 48,028,689	$ 14,002,571	$ (2,817,392)	$ (20,402,481)	$ 38,811,387
Ending balance (in shares) at Dec. 31, 2022	5,552,351					5,552,351