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Consolidated Statements of Comprehensive Income - USD ($)
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Net income $ 3,759,000 $ 5,852,000
Post-retirement benefit plan adjustments:    
Amortization of net actuarial (gain) loss (37,000) 6,000
Amortization of prior service credits (124,000) (124,000)
Net of tax benefit 34,000 25,000
Comprehensive income 3,465,000 5,900,000
Foreign currency hedging derivatives:    
Other comprehensive income:    
Unrealized hedge gain (loss) (487,000) 488,000
Income tax benefit 105,000 (105,000)
Interest rate swaps:    
Other comprehensive income:    
Unrealized hedge gain (loss) 272,000 (306,000)
Income tax benefit $ (57,000) $ 64,000