7. Common Stock (Details 2) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Stock options outstanding, beginning	3,978,167	3,643,667	3,334,167
Stock options granted	443,500	529,500	415,000
Stock options exercised	0	0	0
Stock options forfeited	0	(195,000)	(105,500)
Stock options outstanding, ending	4,421,667	3,978,167	3,643,667