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Consolidated Statements of Comprehensive Income - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Net income $ 5,852,000 $ 3,864,000
Post-retirement benefit plan adjustments:    
Amortization of net actuarial loss 6,000 43,000
Amortization of prior service credits (124,000) (124,000)
Income tax benefit 25,000 17,000
Comprehensive income 5,900,000 3,800,000
Foreign currency hedging derivatives:    
Other comprehensive income:    
Unrealized hedge gain 488,000 0
Income tax benefit (105,000) 0
Interest rate swaps:    
Other comprehensive income:    
Unrealized hedge gain (306,000) 0
Income tax benefit $ 64,000 $ 0