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Consolidated Statements of Comprehensive Income - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Net income (loss) $ 1,319,000 $ (3,312,000) $ 7,371,000 $ 4,230,000  
Post-retirement benefit plan adjustments:          
Amortization of net actuarial loss 43,000 43,000 130,000 130,000  
Amortization of prior service credits (124,000) (124,000) (372,000) (372,000)  
Income tax benefit 17,000 18,000 51,000 51,000  
Comprehensive income (loss) 1,389,000 (3,375,000) 7,314,000 $ 4,039,000  
Foreign currency hedging derivatives:          
Other comprehensive income (loss):          
Unrealized hedge loss (626,000) 0 (626,000)   $ 0
Income tax benefit 159,000 0 159,000   0
Interest rate swaps:          
Other comprehensive income (loss):          
Unrealized hedge loss 767,000 0 767,000   0
Income tax benefit $ (166,000) $ 0 $ (166,000)   $ 0