Fair value measurements (Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details)	3 Months Ended
	Mar. 31, 2021 USD ($)
Changes in the fair value of Level 3 liabilities measured at fair value on recurring basis
Balance at the beginning of the period	$ 112,852
Change in Fair Value	101,390
Effect of Foreign Exchange Rates	(7,269)
Balance at the end of the period	206,973
Participation percentage interest liability [Member]
Changes in the fair value of Level 3 liabilities measured at fair value on recurring basis
Balance at the beginning of the period	112,852
Change in Fair Value	101,390
Effect of Foreign Exchange Rates	(7,269)
Balance at the end of the period	$ 206,973