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Consolidated Statements of Comprehensive Income - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Net income $ 3,160,000 $ 4,354,000 $ 13,338,000 $ 18,142,000  
Post-retirement benefit plan adjustments:          
Amortization of net actuarial (gain) loss (37,000) 6,000 (111,000) 18,000  
Amortization of prior service credits (124,000) (124,000) (372,000) (372,000)  
Net tax benefit 34,000 25,000 101,000 75,000  
Comprehensive income 1,767,000 3,720,000 10,620,000 18,311,000  
Foreign currency hedging derivatives:          
Other comprehensive income:          
Unrealized hedge gain (loss) (1,040,000) (898,000) (2,672,000)   $ 208,000
Income tax benefit (expense) 216,000 192,000 563,000 50,000 (50,000)
Interest rate swaps:          
Other comprehensive income:          
Unrealized hedge gain (loss) (558,000) 209,000 (285,000)   366,000
Income tax benefit (expense) $ 116,000 $ (44,000) $ 58,000 $ (76,000) $ (76,000)