Common Stock (Details 2) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Stock
Stock options outstanding, ending	4,855,167	4,421,667	3,978,167
Stock options granted	463,500	443,500	529,500
Stock options exercised	0	0	0
Stock options forfeited	(30,000)	0	(195,000)