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Risk management and concentrations of risk - Interest rate swap agreements (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2022
USD ($)
2.941% Interest Rate [Member]  
Derivative [Line Items]  
Derivative, Interest rate index LIBOR
Derivative, Notional amount $ 49,738
Derivative Liability, Fair Value carrying amount assets $ 157
Derivative, Term Jan 2026
Derivative, Fixed interest rate 2.941%
2.838% Interest Rate [Member]  
Derivative [Line Items]  
Derivative, Interest rate index LIBOR
Derivative, Notional amount $ 49,738
Derivative Liability, Fair Value carrying amount assets $ 297
Derivative, Term Oct 2025
Derivative, Fixed interest rate 2.838%
2.735% Interest Rate [Member]  
Derivative [Line Items]  
Derivative, Interest rate index LIBOR
Derivative, Notional amount $ 49,738
Derivative Liability, Fair Value carrying amount assets $ 446
Derivative, Term Jan 2026
Derivative, Fixed interest rate 2.735%
2.650% Interest Rate [Member]  
Derivative [Line Items]  
Derivative, Interest rate index LIBOR
Derivative, Notional amount $ 49,738
Derivative Liability, Fair Value carrying amount assets $ 541
Derivative, Term Jan 2026
Derivative, Fixed interest rate 2.65%
Lampung  
Derivative [Line Items]  
Derivative, Interest rate index LIBOR
Derivative, Notional amount $ 56,994
Derivative Liability, Fair Value carrying amount assets $ 360
Derivative, Term Sep 2026
Derivative, Fixed interest rate 2.80%