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Operating revenues (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Notes and other explanatory information [abstract]    
January 1 $ 343,400 $ 346,469
Deferred 3,009,076 3,120,455
Recognized in revenue during the year (3,009,699) (3,123,524)
December 31 $ 342,777 $ 343,400