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Financial instruments, Derivatives interest rate swaps (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Derivatives - interest rate swaps [Abstract]    
Notional amount $ 334,365 $ 357,141
Fair value $ 11,224 23,673
Swap Pays 2.987% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 2.987%  
Expiries Apr. 20, 2023  
Notional amount $ 39,600 42,000
Fair value $ 1,173 2,541
Swap Pays 3.012%, [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 3.012%  
Expiries Apr. 20, 2023  
Notional amount $ 39,600 42,000
Fair value $ 1,185 2,564
Swap Pays 3.019% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 3.019%  
Expiries Sep. 29, 2023  
Notional amount $ 28,176 30,743
Fair value $ 1,017 2,131
Swap Pays 3.019% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 3.019%  
Expiries Sep. 29, 2023  
Notional amount $ 27,262 29,829
Fair value $ 982 2,060
Swap Pays 2.8665% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 2.8665%  
Expiries Sep. 29, 2023  
Notional amount $ 43,690 46,260
Fair value $ 1,509 3,147
Swap Pays 2.8785% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 2.8785%  
Expiries Jun. 30, 2023  
Notional amount $ 38,106 40,673
Fair value $ 1,162 2,513
Swap Pays 2.885% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 2.885%  
Expiries Sep. 29, 2023  
Notional amount $ 43,048 45,618
Fair value $ 1,504 3,139
Swap Pays 2.897% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 2.897%  
Expiries Sep. 30, 2023  
Notional amount $ 38,284 40,851
Fair value $ 1,339 2,792
Swap Pays 3.020% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 3.02%  
Expiries Sep. 29, 2023  
Notional amount $ 36,600 39,167
Fair value $ 1,353 $ 2,786