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					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, 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					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					5,530,363