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Vessel revenue - Terms of time chartered vessels (Details)
 1 Months Ended 12 Months Ended
Apr. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Aug. 31, 2022
USD ($)
Jul. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
May 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
vessel
Disclosure of maturity analysis of operating lease payments [line items]                
Number pf time charter-out agreements | vessel               14
Vessels | LR2 | STI Gratitude                
Disclosure of maturity analysis of operating lease payments [line items]                
Term of lease             3 years 3 years
Operating leases daily rate receivable               $ 28,000
Term of first extension             $ 31,000  
Term of second extension             $ 33,000  
Vessels | LR2 | STI Guard                
Disclosure of maturity analysis of operating lease payments [line items]                
Term of lease         5 years     5 years
Operating leases daily rate receivable         $ 28,000     $ 28,000
Term of option to convert         3 years      
Daily rate of modification option         $ 30,000      
Term of modification         30 months      
Vessels | LR2 | STI Gladiator                
Disclosure of maturity analysis of operating lease payments [line items]                
Term of lease               3 years
Operating leases daily rate receivable               $ 28,000
Vessels | LR2 | STI Guide                
Disclosure of maturity analysis of operating lease payments [line items]                
Term of lease               3 years
Operating leases daily rate receivable               $ 28,000
Vessels | LR2 | STI Connaught                
Disclosure of maturity analysis of operating lease payments [line items]                
Term of lease       3 years       3 years
Operating leases daily rate receivable       $ 30,000       $ 30,000
Term of first extension       32,000        
Term of second extension       $ 34,000        
Vessels | LR2 | STI Lombard                
Disclosure of maturity analysis of operating lease payments [line items]                
Term of lease     3 years         3 years
Operating leases daily rate receivable     $ 32,750         $ 32,750
Term of first extension     34,750          
Term of second extension     $ 36,750          
Vessels | LR2 | STI Gauntlet                
Disclosure of maturity analysis of operating lease payments [line items]                
Term of lease               3 years
Operating leases daily rate receivable               $ 32,750
Vessels | LR2 | STI Lavender                
Disclosure of maturity analysis of operating lease payments [line items]                
Term of lease               3 years
Operating leases daily rate receivable               $ 35,000
Vessels | LR2 | STI Grace                
Disclosure of maturity analysis of operating lease payments [line items]                
Term of lease   3 years           3 years
Operating leases daily rate receivable   $ 37,500           $ 37,500
Daily rate, period one   47,000            
Daily rate period two   28,000            
Daily rate period three   $ 37,500            
Vessels | LR2 | STI Gladiator and STI Guide                
Disclosure of maturity analysis of operating lease payments [line items]                
Term of lease         3 years      
Operating leases daily rate receivable         $ 28,000      
Term of first extension         31,000      
Term of second extension         $ 33,000      
Vessels | LR2 | STI Jermyn                
Disclosure of maturity analysis of operating lease payments [line items]                
Term of lease 3 years             3 years
Operating leases daily rate receivable $ 40,000             $ 40,000
Term of first extension $ 42,500              
Vessels | MR | STI Marshall                
Disclosure of maturity analysis of operating lease payments [line items]                
Term of lease         3 years     3 years
Operating leases daily rate receivable         $ 23,000     $ 23,000
Term of first extension         24,000      
Term of second extension         25,000      
Term of third extension         $ 26,000      
Vessels | MR | STI Magnetic                
Disclosure of maturity analysis of operating lease payments [line items]                
Term of lease         3 years     3 years
Operating leases daily rate receivable         $ 23,000     $ 23,000
Term of first extension         24,500      
Term of second extension         26,000      
Daily rate, period one         30,000      
Daily rate period two         20,000      
Daily rate period three         $ 19,000      
Vessels | MR | STI Miracle                
Disclosure of maturity analysis of operating lease payments [line items]                
Term of lease       3 years       3 years
Operating leases daily rate receivable       $ 21,000       $ 21,000
Term of first extension       22,500        
Term of second extension       24,000        
Term of third extension       19,000        
Daily rate, period one       30,000        
Daily rate period two       $ 20,000        
Vessels | MR | STI Memphis                
Disclosure of maturity analysis of operating lease payments [line items]                
Term of lease           3 years   3 years
Operating leases daily rate receivable           $ 21,000   $ 21,000
Term of first extension           22,500    
Term of second extension           24,000    
Daily rate, period one           30,000    
Daily rate period two           20,000    
Daily rate period three           $ 19,000    
Vessels | MR | STI Duchessa                
Disclosure of maturity analysis of operating lease payments [line items]                
Term of lease               3 years
Operating leases daily rate receivable               $ 25,000