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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Pension, health and life insurance expense:        
Multi-employer plan $ 221,000 $ 179,000 $ 682,000 $ 600,000
Defined contribution plan 371,000 263,000 1,122,000 881,000
Total pension expense 592,000 442,000 1,804,000 1,481,000
Interest cost 50,000 41,000 149,000 122,000
Amortization of prior service credits (124,000) (124,000) (372,000) (372,000)
Amortization of net loss 43,000 43,000 130,000 130,000
Net periodic benefit credit (31,000) (40,000) (93,000) (120,000)
Total post-retirement benefits expense 561,000 $ 402,000 1,711,000 $ 1,361,000
Pension Plan        
Pension, health and life insurance expense:        
Payments made to pension plans     2,349,000  
Pension plan payments expected to be made in fiscal year 741,000   741,000  
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     467,000  
Pension plan payments expected to be made in fiscal year 924,000   924,000  
Pension plan payments accrued $ 924,000   $ 924,000