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Long-term debt - Covenants (Details)
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
USD ($)
Sep. 30, 2021
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
period
Disclosure of detailed information about borrowings [table]          
Minimum interest coverage ratio 2.00 1.25 1.00    
Minimum EBITDA | $   $ 30,000,000   $ 70,000,000 $ 25,000,000
Remaining periods eligible to be waived | period         2