Stock options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Options
Outstanding at beginning	5,004,167	4,167	1,154,167
Granted	5,000,000	5,000,000
Exercised	4,167
Outstanding at ending	10,000,000	5,004,167
Weighted-Average Exercise Price
Weighted average exercise price beginning	$ 0.33	$ 3.12
Exercise Price granted	0.35	0.33
Cancelled or Exercised	3.12
Weighted average exercise price ending	$ 0.34	$ 0.33