CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)	Shares Outstanding [Member]	Additional Paid in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
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
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, net of surrenders		4,489				4,489
Stock option exercises, net of surrenders (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, 2020		47,404,869	8,693,519	(2,787,898)	1,669,866	$ 54,980,356
Beginning balance (in shares) at Dec. 31, 2020	5,520,469					5,520,469
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			1,810,075			$ 1,810,075
Other comprehensive income (loss)					(2,343,977)	(2,343,977)
Stock option exercises, net of surrenders		39,589		(8,344)		31,245
Stock option exercises, net of surrenders (in shares)	4,147
Stock-based compensation expense		22,997				22,997
Cash dividends			(1,491,646)			(1,491,646)
Ending balance at Mar. 31, 2021		$ 47,467,455	$ 9,011,948	$ (2,796,242)	$ (674,111)	$ 53,009,050
Ending balance (in shares) at Mar. 31, 2021	5,524,616					5,524,616