CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2017	$ 44,145	$ 19,865,273	$ 20,807,679	$ 40,717,097
Balance, shares at Dec. 31, 2017	4,414,492
Exercise of stock options	$ 674	569,194		569,868
Exercise of stock options, shares	67,440
Stock-based compensation		345,626		345,626
Dividend distribution			(1,257,936)	(1,257,936)
401(K) stock match	$ 344	527,325		527,669
401(K) stock match, shares	34,383
Issuance of restricted stock	$ 28	(28)
Issuance of restricted stock, shares	2,788
Shares issued under Employee Stock Purchase Plan	$ 86	113,496		113,582
Shares issued under Employee Stock Purchase Plan, shares	8,582
Net income			5,718,444	5,718,444
Balance at Dec. 31, 2018	$ 45,277	21,420,886	25,268,187	46,734,350
Balance, shares at Dec. 31, 2018	4,527,685
Exercise of stock options	$ 413	272,869		273,282
Exercise of stock options, shares	41,310
Other share retirements	$ (59)	(27,915)	(62,048)	(90,022)
Other share retirements, shares	(5,863)
Stock-based compensation		235,105		235,105
Dividend distribution			(1,288,681)	(1,288,681)
401(K) stock match	$ 521	687,979		688,500
401(K) stock match, shares	52,089
Issuance of restricted stock	$ 110	(55,044)		(54,934)
Issuance of restricted stock, shares	10,968
Shares issued under Employee Stock Purchase Plan	$ 183	200,053		200,236
Shares issued under Employee Stock Purchase Plan, shares	18,333
Net income			2,718,274	2,718,274
Balance at Dec. 31, 2019	$ 46,445	$ 22,733,933	$ 26,635,732	$ 49,416,110
Balance, shares at Dec. 31, 2019	4,644,522