7. Common Stock (Details 2) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Stock options outstanding, beginning	3,643,667	3,334,167	2,957,667
Stock options granted	529,500	415,000	410,500
Stock options exercised	0	0	0
Stock options forfeited	(195,000)	(105,500)	(34,000)
Stock options outstanding, ending	3,978,167	3,643,667	3,334,167