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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net income $ 1,877 $ 3,160 $ 8,112 $ 13,338
Post-retirement benefit plan adjustments:        
Amortization of net actuarial gain (22) (37) (61) (111)
Amortization of prior service credits (124) (124) (372) (372)
Net tax benefit 31 34 91 101
Comprehensive income 1,491 1,767 9,314 10,620
Foreign currency hedging derivatives:        
Other comprehensive income:        
Unrealized hedge gain (loss) (299) (1,040) 2,309 (2,672)
Income tax benefit 68 216 (485) 563
Interest rate swaps:        
Other comprehensive income:        
Unrealized hedge gain (loss) (50) (558) (354) (285)
Income tax benefit $ 10 $ 116 $ 74 $ 58