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Consolidated Statement of Stockholders' Equity (Parenthetical) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Change in post-retirement benefits, tax $ 34,000 $ 25,000 $ 67,000 $ 50,000  
Foreign currency hedging derivatives:          
Income tax benefit (expense) 241,000 (137,000) 347,000 241,000 $ (241,000)
Interest rate swaps:          
Income tax benefit (expense) $ 0 $ (97,000) $ (58,000) $ (32,000) $ (32,000)