Income taxes - (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Tax credit at the federal and state statutory rate	$ 478,522	$ 857,250
Prior year over provision	250,000
Foreign taxation	(5,309)	(56,212)
Permanent differences	(271,310)	(1,091,032)
Foreign tax rate differential	(100)	1,061
Net operating loss utilized	5,594
Valuation allowance	(176,494)	288,933
Net future tax asset	$ 280,903