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Consolidated Statement of Stockholders' Equity (Parenthetical) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Change in post-retirement benefits, tax $ 31,000 $ 34,000 $ 60,000 $ 67,000
Foreign currency hedging derivatives:        
Income tax benefit (251,000) 241,000 (553,000) 347,000
Interest rate swaps:        
Income tax benefit $ 23,000 $ 0 $ 64,000 $ (58,000)