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Provisions and contingencies - Narrative (Details)
 12 Months Ended
Jan. 15, 2021
tons
Jul. 14, 2015
Dec. 31, 2023
USD ($)
Jan. 31, 2024
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Disclosure of other provisions [line items]            
Extension of acquired lease term   5 years        
Other provisions     $ 598,000   $ 892,000 $ 1,154,000
Unicredit Bank in London            
Disclosure of other provisions [line items]            
Misdelivery of fuel | tons 101,809          
RMK            
Disclosure of other provisions [line items]            
Other provisions     0      
Claim amount related to unpaid advisory services     $ 12,993,720      
Black Swan | Commencement of major litigation [member]            
Disclosure of other provisions [line items]            
Cash security posted       $ 45,711,840