Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2019		$ 775	$ 13,894,680		$ (3,714,255)	$ 10,181,200
Balance, shares at Dec. 31, 2019		7,745,030
Stock options exercised		$ 1	6,299			6,300
Stock options exercised, shares		7,500
Stock options repurchased			(2,778)			(2,778)
Net income loss					(389,410)	(389,410)
Balance at Mar. 31, 2020		$ 776	13,898,201		(4,103,665)	9,795,312
Balance, shares at Mar. 31, 2020		7,752,530
Balance at Dec. 31, 2020		$ 778	13,893,660		(2,235,852)	11,658,586
Balance, shares at Dec. 31, 2020		7,775,030
Stock options exercised			3,620			3,620
Stock options exercised, shares		2,500
Net income loss					655,163	655,163
Balance at Mar. 31, 2021		$ 778	$ 13,897,280		$ (1,580,689)	$ 12,317,369
Balance, shares at Mar. 31, 2021		7,777,530