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Financial risk management, objectives and policies, ABN AMRO Revolving Credit Facility (Details) - ABN AMRO Revolving Credit Facility [Member] - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jul. 31, 2018
Jun. 30, 2019
Dec. 31, 2021
Apr. 30, 2018
Nov. 30, 2016
Credit Facility [Abstract]          
Term     5 years    
Maximum borrowing capacity       $ 57.3 $ 50.0
Frequency of periodic repayment     quarterly    
Reduction amount in credit facility $ 1.8 $ 1.3