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Financial risk management, objectives and policies, Credit risk (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Institution
Vessel
Counterparty
Customer
Dec. 31, 2020
USD ($)
Vessel
Customer
Counterparty
Dec. 31, 2019
Vessel
Customer
Counterparty
Credit risk [Abstract]      
Number of vessels chartered with counterparties | Vessel 7 18 5
Number of vessels | Vessel 26 27 27
Number of counterparties | Counterparty 5 10 4
Number of vessels operated in spot market | Vessel 19 9 22
Number of financial institutions for holding cash | Institution 6    
Number of major customers | Customer 5 5 5
Current trade receivables [1] $ 30,361 $ 30,060  
Disclosure of maximum credit exposure [Abstract]      
Cash and cash equivalents 60,658 68,641  
Accounts receivable and accrued revenues 30,361 30,060  
Maximum credit exposure 91,018 $ 98,700  
Customer One [Member]      
Credit risk [Abstract]      
Current trade receivables 10,317    
Customer Two [Member]      
Credit risk [Abstract]      
Current trade receivables 5,164    
Customer Three [Member]      
Credit risk [Abstract]      
Current trade receivables 5,156    
Customer Four [Member]      
Credit risk [Abstract]      
Current trade receivables 2,999    
Customer Five [Member]      
Credit risk [Abstract]      
Current trade receivables $ 2,411    
[1] Amortized cost.