CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)	Additional Paid in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning Balance at Dec. 31, 2015	$ 36,341,744	$ 4,064,834	$ (2,247,415)	$ 992,549	$ 39,151,712
Net income		5,247,063			5,247,063
Other comprehensive loss				(1,599,658)	(1,599,658)
Stock option exercises	405,749				405,749
Stock-based compensation expense	76,529				76,529
Cash dividends		(2,668,421)			(2,668,421)
Ending balance at Dec. 31, 2016	36,824,022	6,643,476	(2,247,415)	(607,109)	40,612,974
Net income		4,901,825			4,901,825
Other comprehensive loss				(276,879)	(276,879)
Stock option exercises	340,843				340,843
Stock-based compensation expense	71,701				71,701
Reclassification of tax effects stranded in accumulated other comprehensive income by tax reform		187,692		(187,692)
Cash dividends		(2,885,829)			(2,885,829)
Ending balance at Dec. 31, 2017	37,236,566	8,847,164	(2,247,415)	(1,071,680)	42,764,635
Net income		6,922,934			6,922,934
Other comprehensive loss				(705,525)	(705,525)
Stock option exercises	214,418		(20,849)		193,569
Stock-based compensation expense	72,408				72,408
Cash dividends		(3,785,460)			(3,785,460)
Common stock dividend, 10%	9,334,342	(9,334,342)
Ending balance at Dec. 31, 2018	$ 46,857,734	$ 2,650,296	$ (2,268,264)	$ (1,777,205)	$ 45,462,561