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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Pension, health and life insurance expense:        
Multi-employer plan $ 199,000 $ 221,000 $ 624,000 $ 734,000
Defined contribution plan 459,000 471,000 1,397,000 1,440,000
Total pension expense 658,000 692,000 2,021,000 2,174,000
Interest cost 23,000 66,000 69,000 197,000
Amortization of prior service credits (124,000) (124,000) (372,000) (372,000)
Amortization of net loss (gain) (37,000) 6,000 (111,000) 18,000
Net periodic benefit credit (138,000) (52,000) (414,000) (157,000)
Total post-retirement benefits expense 520,000 $ 640,000 1,607,000 $ 2,017,000
Pension Plan        
Pension, health and life insurance expense:        
Payments made to pension plans     2,156,000  
Pension plan payments expected to be made in fiscal year 479,000   479,000  
Pension plan payments accrued 93,000   93,000  
Other Postretirement Benefits Plan        
Pension, health and life insurance expense:        
Payments for post retirement healthcare and life insurance     455,000  
Pension plan payments expected to be made in fiscal year 93,000   93,000  
Pension plan payments accrued $ 93,000   $ 93,000