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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Pension, health and life insurance expense:        
Multi-employer plan $ 274,000 $ 254,000 $ 513,000 $ 461,000
Defined contribution plan 441,000 386,000 969,000 751,000
Total pension expense 715,000 640,000 1,482,000 1,212,000
Interest cost 67,000 49,000 132,000 99,000
Amortization of prior service credits (124,000) (125,000) (248,000) (248,000)
Amortization of net actuarial loss 5,000 45,000 11,000 87,000
Net periodic benefit credit (52,000) (31,000) (105,000) (62,000)
Total post-retirement benefits expense 663,000 $ 609,000 1,377,000 $ 1,150,000
Pension Plan        
Pension, health and life insurance expense:        
Payments made to pension plans     1,669,000  
Pension plan payments expected to be made in fiscal year 1,285,000   1,285,000  
Pension plan payments accrued 274,000   274,000  
Other Postretirement Benefits Plan        
Pension, health and life insurance expense:        
Payments for post retirement healthcare and life insurance     349,000  
Pension plan payments expected to be made in fiscal year 1,085,000   1,085,000  
Pension plan payments accrued $ 1,085,000   $ 1,085,000