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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Pension, health and life insurance expense:        
Multi-employer plan $ 211,000 $ 274,000 $ 425,000 $ 513,000
Defined contribution plan 432,000 441,000 938,000 969,000
Total pension expense 643,000 715,000 1,363,000 1,482,000
Interest cost 23,000 67,000 46,000 132,000
Amortization of prior service credits (124,000) (124,000) (248,000) (248,000)
Amortization of net loss (37,000) 5,000 (74,000) 11,000
Net periodic benefit credit (138,000) (52,000) (276,000) (105,000)
Total post-retirement benefits expense 505,000 $ 663,000 1,087,000 $ 1,377,000
Pension Plan        
Pension, health and life insurance expense:        
Payments made to pension plans     1,655,000  
Pension plan payments expected to be made in fiscal year 953,000   953,000  
Pension plan payments accrued 104,000   104,000  
Other Postretirement Benefits Plan        
Pension, health and life insurance expense:        
Payments for post retirement healthcare and life insurance     553,000  
Pension plan payments expected to be made in fiscal year 104,000   104,000  
Pension plan payments accrued $ 104,000   $ 104,000