Subsequent events (Details Narrative) - $ / shares	Jan. 11, 2022	Dec. 31, 2021	Dec. 31, 2020	Apr. 10, 2015
Subsequent Event [Line Items]
Class of warrant, outstanding		6,200,000
Exercise price of warrants		$ 2.11	$ 2.11	$ 1.60
Common stock, shares, outstanding		22,850,947	22,850,947
Series B Common Stock Warrants [Member]
Subsequent Event [Line Items]
Exercise price of warrants			$ 0.11
Series D Common Stock Warrants [Member]
Subsequent Event [Line Items]
Exercise price of warrants			$ 1.60
Chief Executive Officer [Member] | Series B warrants [Member]
Subsequent Event [Line Items]
Exercise price of warrants	$ 1.60
Chief Executive Officer [Member] | Series B Common Stock Warrants [Member]
Subsequent Event [Line Items]
Class of warrant, outstanding		87,456
Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock, shares, outstanding	22,941,357
Subsequent Event [Member] | Chief Executive Officer [Member]
Subsequent Event [Line Items]
Exercise price of warrants	$ 0.11
Common stock, shares, outstanding	90,410
Subsequent Event [Member] | Chief Executive Officer [Member] | Series B Common Stock Warrants [Member]
Subsequent Event [Line Items]
Class of warrant, outstanding	0
Subsequent Event [Member] | Chief Executive Officer [Member] | Series D Common Stock Warrants [Member]
Subsequent Event [Line Items]
Class of warrant, outstanding	6,250,000
Subsequent Event [Member] | Chief Executive Officer [Member] | Series B Common Stock Warrants [Member]
Subsequent Event [Line Items]
Class of warrant, outstanding	87,456
Subsequent Event [Member] | Chief Executive Officer [Member] | Series D Common Stock Warrants [Member]
Subsequent Event [Line Items]
Class of warrant, outstanding	2,954