Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2019	39,612,659	(12,253,502)
Balance at Dec. 31, 2019	$ 39,613	$ (18,929,915)	$ 96,105,851	$ (41,351,078)	$ 35,864,471
Stock-based compensation expense	$ 0	$ 0	426,939	0	426,939
Issuance of common stock upon exercise of stock options (in shares)	100,000	0
Issuance of common stock upon exercise of stock options	$ 100	$ 0	174,900	0	175,000
Net loss	$ 0	$ 0	0	(2,214,139)	(2,214,139)
Balance (in shares) at Mar. 31, 2020	39,712,659	(12,253,502)
Balance at Mar. 31, 2020	$ 39,713	$ (18,929,915)	96,707,690	(43,565,217)	34,252,271
Balance (in shares) at Dec. 31, 2019	39,612,659	(12,253,502)
Balance at Dec. 31, 2019	$ 39,613	$ (18,929,915)	96,105,851	(41,351,078)	35,864,471
Issuance of common stock upon exercise of stock options (in shares)	123,000
Net loss					(7,365,060)
Balance (in shares) at Sep. 30, 2020	39,735,659	(12,253,502)
Balance at Sep. 30, 2020	$ 39,736	$ (18,929,915)	97,600,771	(48,716,138)	29,994,454
Balance (in shares) at Mar. 31, 2020	39,712,659	(12,253,502)
Balance at Mar. 31, 2020	$ 39,713	$ (18,929,915)	96,707,690	(43,565,217)	34,252,271
Stock-based compensation expense	$ 0	$ 0	436,613	0	436,613
Issuance of common stock upon exercise of stock options (in shares)	23,000	0
Issuance of common stock upon exercise of stock options	$ 23	$ 0	55,720	0	55,743
Net loss	$ 0	$ 0	0	(2,651,422)	(2,651,422)
Balance (in shares) at Jun. 30, 2020	39,735,659	(12,253,502)
Balance at Jun. 30, 2020	$ 39,736	$ (18,929,915)	97,200,023	(46,216,639)	32,093,205
Stock-based compensation expense	$ 0	$ 0	400,680	0	400,680
Issuance of common stock upon exercise of stock options (in shares)	0	0
Issuance of common stock upon exercise of stock options	$ 0	$ 0	68	0	68
Net loss	$ 0	$ 0	0	(2,499,499)	(2,499,499)
Balance (in shares) at Sep. 30, 2020	39,735,659	(12,253,502)
Balance at Sep. 30, 2020	$ 39,736	$ (18,929,915)	97,600,771	(48,716,138)	29,994,454
Balance (in shares) at Dec. 31, 2020	39,747,659	(12,253,502)
Balance at Dec. 31, 2020	$ 39,748	$ (18,929,915)	98,013,079	(50,676,351)	28,446,561
Stock-based compensation expense	$ 0	$ 0	421,071	0	421,071
Issuance of common stock upon exercise of stock options (in shares)	60,000	0
Issuance of common stock upon exercise of stock options	$ 60	$ 0	115,740	0	115,800
Net loss	$ 0	$ 0	0	(3,294,949)	(3,294,949)
Balance (in shares) at Mar. 31, 2021	39,807,659	(12,253,502)
Balance at Mar. 31, 2021	$ 39,808	$ (18,929,915)	98,549,890	(53,971,300)	25,688,483
Balance (in shares) at Dec. 31, 2020	39,747,659	(12,253,502)
Balance at Dec. 31, 2020	$ 39,748	$ (18,929,915)	98,013,079	(50,676,351)	$ 28,446,561
Issuance of common stock upon exercise of stock options (in shares)	585,000				585,000
Net loss					$ (8,856,391)
Balance (in shares) at Sep. 30, 2021	40,332,659	(12,253,502)
Balance at Sep. 30, 2021	$ 40,333	$ (18,929,915)	100,322,444	(59,532,742)	21,900,120
Balance (in shares) at Mar. 31, 2021	39,807,659	(12,253,502)
Balance at Mar. 31, 2021	$ 39,808	$ (18,929,915)	98,549,890	(53,971,300)	25,688,483
Stock-based compensation expense	$ 0	$ 0	446,120	0	446,120
Issuance of common stock upon exercise of stock options (in shares)	525,000	0
Issuance of common stock upon exercise of stock options	$ 525	$ 0	869,815	0	870,340
Net loss	$ 0	$ 0	0	(3,846,174)	(3,846,174)
Balance (in shares) at Jun. 30, 2021	40,332,659	(12,253,502)
Balance at Jun. 30, 2021	$ 40,333	$ (18,929,915)	99,865,825	(57,817,474)	23,158,769
Stock-based compensation expense	$ 0	$ 0	457,209	0	457,209
Issuance of common stock upon exercise of stock options (in shares)	0	0
Issuance of common stock upon exercise of stock options	$ 0	$ 0	(590)	0	(590)
Net loss	$ 0	$ 0	0	(1,715,268)	(1,715,268)
Balance (in shares) at Sep. 30, 2021	40,332,659	(12,253,502)
Balance at Sep. 30, 2021	$ 40,333	$ (18,929,915)	$ 100,322,444	$ (59,532,742)	$ 21,900,120