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Long-term debt - Long-term debt advances (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument    
Long-term debt $ 555 $ 2,711
Long-term 4.69% fixed rate debt due March 2023    
Debt Instrument    
Long-term debt $ 555 $ 2,711
Fixed interest rate (as a percent) 4.69%