Statements of Stockholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Dec. 31, 2019	$ 610,400	$ 12,483,900	$ (10,304,600)	$ 2,789,700
Beginning balance, shares at Dec. 31, 2019	61,044,698
Net income			52,600	52,600
Ending balance, value at Mar. 31, 2020	$ 610,400	12,483,900	(10,252,000)	2,842,300
Ending balance, shares at Mar. 31, 2020	61,044,698
Net income			70,800	70,800
Ending balance, value at Jun. 30, 2020	$ 610,400	12,483,900	(10,181,200)	2,913,100
Ending balance, shares at Jun. 30, 2020	61,044,698
Beginning balance, value at Dec. 31, 2020	$ 673,500	12,575,800	(9,796,200)	3,453,100
Beginning balance, shares at Dec. 31, 2020	67,353,690
Net income			114,800	114,800
Ending balance, value at Mar. 31, 2021	$ 673,500	12,575,800	(9,681,400)	3,567,900
Ending balance, shares at Mar. 31, 2021	67,353,690
Net income			42,500	42,500
Exercise of warrants	$ 1,500	1,300		2,800
Exercise of warrants, shares	141,365
Ending balance, value at Jun. 30, 2021	$ 675,000	$ 12,577,100	$ (9,638,900)	$ 3,613,200
Ending balance, shares at Jun. 30, 2021	67,495,055