CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($)	Total	Common Stock	Treasury Stock	Additional paid-in capital	Accumulated deficit
Beginning 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	309,563			309,563
Net loss	(2,175,258)				(2,175,258)
Ending balance at Mar. 31, 2019	40,585,474	38,967	(18,929,915)	94,694,793	(35,218,371)
Beginning 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]
Net loss	(4,871,050)
Ending balance at Jun. 30, 2019	38,619,465	39,365	(18,929,915)	95,424,178	(37,914,163)
Beginning balance at Mar. 31, 2019	40,585,474	38,967	(18,929,915)	94,694,793	(35,218,371)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	580,603			580,603
Net loss	(2,695,792)				(2,695,792)
Ending balance at Jun. 30, 2019	$ 38,619,465	$ 39,365	$ (18,929,915)	95,424,178	(37,914,163)
Beginning balance (in shares) at Dec. 31, 2019	39,612,659	39,612,659	(12,253,502)
Beginning balance at Dec. 31, 2019	$ 35,864,471	$ 39,613	$ (18,929,915)	96,105,851	(41,351,078)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	426,939			426,939
Exercise of stock options	175,000	100		174,900
Net loss	(2,214,139)				(2,214,139)
Ending balance at Mar. 31, 2020	$ 34,252,271	$ 39,713	$ (18,929,915)	96,707,690	(43,565,217)
Beginning balance (in shares) at Dec. 31, 2019	39,612,659	39,612,659	(12,253,502)
Beginning balance at Dec. 31, 2019	$ 35,864,471	$ 39,613	$ (18,929,915)	96,105,851	(41,351,078)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 863,552			863,552
Exercise of stock options (in shares)	123,000	123,000
Exercise of stock options	$ 230,743	$ 123		230,620
Net loss	$ (4,865,561)				(4,865,561)
Ending balance (in shares) at Jun. 30, 2020	39,735,659	39,735,659	(12,253,502)
Ending balance at Jun. 30, 2020	$ 32,093,205	$ 39,736	$ (18,929,915)	97,200,023	(46,216,639)
Beginning balance at Mar. 31, 2020	34,252,271	39,713	$ (18,929,915)	96,707,690	(43,565,217)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options	55,743	$ 23		55,720
Net loss	$ (2,651,422)				(2,651,422)
Ending balance (in shares) at Jun. 30, 2020	39,735,659	39,735,659	(12,253,502)
Ending balance at Jun. 30, 2020	$ 32,093,205	$ 39,736	$ (18,929,915)	$ 97,200,023	$ (46,216,639)