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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Pension, health and life insurance expense:        
Multi-employer plan $ 221,000 $ 221,000 $ 734,000 $ 682,000
Defined contribution plan 471,000 371,000 1,440,000 1,122,000
Total pension expense 692,000 592,000 2,174,000 1,804,000
Interest cost 66,000 50,000 197,000 149,000
Amortization of prior service credits (124,000) (124,000) (372,000) (372,000)
Amortization of net actuarial loss 6,000 43,000 18,000 130,000
Net periodic benefit credit (52,000) (31,000) (157,000) (93,000)
Total post-retirement benefits expense 640,000 $ 561,000 2,017,000 $ 1,711,000
Pension Plan        
Pension, health and life insurance expense:        
Payments made to pension plans     2,204,000  
Pension plan payments expected to be made in fiscal year 779,000   779,000  
Pension plan payments accrued 259,000   259,000  
Other Postretirement Benefits Plan        
Pension, health and life insurance expense:        
Payments for post retirement healthcare and life insurance     563,000  
Pension plan payments expected to be made in fiscal year 871,000   871,000  
Pension plan payments accrued $ 871,000   $ 871,000