CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2018	$ 60,542,718	$ 15,329	$ 159,701,542	$ (99,174,153)
Beginning Balance, Shares at Dec. 31, 2018		15,328,870
Stock-based compensation	204,031		204,031
Net income (loss)	(163,752)			(163,752)
Ending Balance at Mar. 31, 2019	60,582,997	$ 15,329	159,905,573	(99,337,905)
Ending Balance, Shares at Mar. 31, 2019		15,328,870
Beginning Balance at Dec. 31, 2018	60,542,718	$ 15,329	159,701,542	(99,174,153)
Beginning Balance, Shares at Dec. 31, 2018		15,328,870
Net income (loss)	(136,650)
Ending Balance at Jun. 30, 2019	60,908,969	$ 15,350	160,204,422	(99,310,803)
Ending Balance, Shares at Jun. 30, 2019		15,350,153
Beginning Balance at Mar. 31, 2019	60,582,997	$ 15,329	159,905,573	(99,337,905)
Beginning Balance, Shares at Mar. 31, 2019		15,328,870
Stock-based compensation	269,201		269,201
Shares issued for Employee Stock Purchase Plan options	29,669	$ 21	29,648
Shares issued for Employee Stock Purchase Plan options, Shares		21,283
Net income (loss)	27,102			27,102
Ending Balance at Jun. 30, 2019	60,908,969	$ 15,350	160,204,422	(99,310,803)
Ending Balance, Shares at Jun. 30, 2019		15,350,153
Beginning Balance at Dec. 31, 2019	61,644,052	$ 15,373	160,858,072	(99,229,393)
Beginning Balance, Shares at Dec. 31, 2019		15,372,905
Stock-based compensation	377,317		377,317
Net income (loss)	(231,667)			(231,667)
Ending Balance at Mar. 31, 2020	61,789,702	$ 15,373	161,235,389	(99,461,060)
Ending Balance, Shares at Mar. 31, 2020		15,372,905
Beginning Balance at Dec. 31, 2019	61,644,052	$ 15,373	160,858,072	(99,229,393)
Beginning Balance, Shares at Dec. 31, 2019		15,372,905
Net income (loss)	977,336
Ending Balance at Jun. 30, 2020	63,429,106	$ 15,403	161,665,760	(98,252,057)
Ending Balance, Shares at Jun. 30, 2020		15,403,111
Beginning Balance at Mar. 31, 2020	61,789,702	$ 15,373	161,235,389	(99,461,060)
Beginning Balance, Shares at Mar. 31, 2020		15,372,905
Stock-based compensation	400,361		400,361
Shares issued for Employee Stock Purchase Plan options	30,040	$ 30	30,010
Shares issued for Employee Stock Purchase Plan options, Shares		30,206
Net income (loss)	1,209,003			1,209,003
Ending Balance at Jun. 30, 2020	$ 63,429,106	$ 15,403	$ 161,665,760	$ (98,252,057)
Ending Balance, Shares at Jun. 30, 2020		15,403,111