Statements of Changes in Stockholders' Equity - USD ($)	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2017		$ 793	$ 14,954,563	$ (112,109)	$ (4,457,070)	$ 10,368,177
Balance, shares at Dec. 31, 2017		7,927,774
Stock options exercised		$ 1	10,499			10,500
Stock options exercised, shares		10,700
Stock based compensation			7,124			7,124
Stock options repurchased			(242,625)			(242,625)
Purchase of treasury stock				(381,937)		(381,937)
Treasury stock cancelled		$ (11)	(456,727)	456,738
Treasury stock cancelled, shares		(110,823)
Net income					818,092	818,092
Balance at Dec. 31, 2018		$ 783	14,272,834	(37,308)	(3,638,978)	10,597,331
Balance, shares at Dec. 31, 2018		7,827,651
Stock options exercised		$ 2	11,424			11,426
Stock options exercised, shares		10,775
Stock options repurchased			(34,076)			(34,076)
Purchase of treasury stock				(318,204)		(318,204)
Treasury stock cancelled		$ (10)	(355,502)	355,512
Treasury stock cancelled, shares		(93,396)
Net income					(75,277)	(75,277)
Balance at Dec. 31, 2019		$ 775	$ 13,894,680		$ (3,714,255)	$ 10,181,200
Balance, shares at Dec. 31, 2019		7,745,030