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Financial instruments, Derivatives interest rate swaps (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Derivatives - interest rate swaps [Abstract]    
Notional amount $ 357,141 $ 379,916
Fair value $ 23,673 15,600
Swap Pays 2.987% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 2.987%  
Expiries Apr. 20, 2023  
Notional amount $ 42,000 44,400
Fair value $ 2,541 1,748
Swap Pays 3.012%, [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 3.012%  
Expiries Apr. 20, 2023  
Notional amount $ 42,000 44,400
Fair value $ 2,564 1,780
Swap Pays 3.019% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 3.019%  
Expiries Sep. 29, 2023  
Notional amount $ 30,743 33,310
Fair value $ 2,131 1,425
Swap Pays 3.019% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 3.019%  
Expiries Sep. 29, 2023  
Notional amount $ 29,829 32,396
Fair value $ 2,060 1,380
Swap Pays 2.8665% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 2.8665%  
Expiries Sep. 29, 2023  
Notional amount $ 46,260 48,830
Fair value $ 3,147 1,976
Swap Pays 2.8785% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 2.8785%  
Expiries Jun. 30, 2023  
Notional amount $ 40,673 43,240
Fair value $ 2,513 1,681
Swap Pays 2.885% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 2.885%  
Expiries Sep. 29, 2023  
Notional amount $ 45,618 48,188
Fair value $ 3,139 1,961
Swap Pays 2.897% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 2.897%  
Expiries Sep. 30, 2023  
Notional amount $ 40,851 43,419
Fair value $ 2,792 1,789
Swap Pays 3.020% [Member]    
Derivatives - interest rate swaps [Abstract]    
Interest rate 3.02%  
Expiries Sep. 29, 2023  
Notional amount $ 39,167 41,734
Fair value $ 2,786 $ 1,859