CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($)	Total	Common Stock	Treasury Stock	Additional paid-in capital	Accumulated deficit
Beginning balance (in shares) at Dec. 31, 2017		38,936,988	(10,609,177)
Beginning balance at Dec. 31, 2017	$ 49,975,264	$ 38,937	$ (16,625,873)	$ 93,913,557	$ (27,351,357)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 467,203			467,203
Exercise of stock options (in shares)	30,000	30,000
Exercise of stock options	$ 4,500	$ 30		4,470
Repurchases of common stock (in shares)			(1,644,325)
Repurchases of common stock	(2,304,042)		$ (2,304,042)
Net loss	$ (5,691,756)				(5,691,756)
Ending balance (in shares) at Dec. 31, 2018	38,966,988	38,966,988	(12,253,502)
Ending balance at Dec. 31, 2018	$ 42,451,169	$ 38,967	$ (18,929,915)	94,385,230	(33,043,113)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 1,171,079			1,171,079
Exercise of stock options (in shares)	781,500	645,671
Exercise of stock options	$ 550,188	$ 646		549,542
Net loss	$ (8,307,965)				(8,307,965)
Ending balance (in shares) at Dec. 31, 2019	39,612,659	39,612,659	(12,253,502)
Ending balance at Dec. 31, 2019	$ 35,864,471	$ 39,613	$ (18,929,915)	$ 96,105,851	$ (41,351,078)