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Income tax reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]      
  Federal rate $ 1,812 $ 924 $ 7,941
State income taxes (net of Federal   income tax benefit) 178 (30) 2,634
Other, net 77 121 (503)
Provision for income taxes $ 2,067 $ 1,015 $ 10,072