Condensed 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, 2017		$ 793	$ 14,954,563	$ (112,109)	$ (4,457,070)	$ 10,386,177
Balance, shares at Dec. 31, 2017		7,927,774
Stock options exercised		$ 1	10,499			10,500
Stock options exercised, shares		7,500
Stock options repurchased			(32,000)			(32,000)
Stock based compensation			6,656			6,656
Net icome (loss)					2,088,150	2,088,150
Balance at Sep. 30, 2018		$ 794	14,939,718	(112,109)	(2,368,920)	12,459,483
Balance, shares at Sep. 30, 2018		7,935,274
Balance at Jun. 30, 2018		$ 794	14,937,922	(112,109)	(2,429,920)	12,396,687
Balance, shares at Jun. 30, 2018		7,935,274
Stock options exercised
Stock based compensation			1,796			1,796
Net icome (loss)					61,000	61,000
Balance at Sep. 30, 2018		$ 794	14,939,718	(112,109)	(2,368,920)	12,459,483
Balance, shares at Sep. 30, 2018		7,935,274
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			(16,110)			(16,110)
Treasury stock				(318,204)		(318,204)
Treasury stock cancelled		$ (10)	(355,502)	355,512
Treasury stock cancelled, shares		(93,396)
Net icome (loss)					(9,526)	(9,526)
Balance at Sep. 30, 2019		$ 775	13,912,646		(3,648,504)	10,264,917
Balance, shares at Sep. 30, 2019		7,745,030
Balance at Jun. 30, 2019		$ 774	13,918,615		(4,585,611)	9,333,778
Balance, shares at Jun. 30, 2019		7,739,255
Stock options exercised		$ 1	5,774			5,775
Stock options exercised, shares		5,775
Stock options repurchased			(11,743)			(11,743)
Net icome (loss)					937,107	937,107
Balance at Sep. 30, 2019		$ 775	$ 13,912,646		$ (3,648,504)	$ 10,264,917
Balance, shares at Sep. 30, 2019		7,745,030