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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Pension, health and life insurance expense:        
Multi-employer plan $ 254,000 $ 232,000 $ 461,000 $ 421,000
Defined contribution plan 386,000 316,000 751,000 618,000
Total pension expense 640,000 548,000 1,212,000 1,039,000
Interest cost 49,000 40,000 99,000 81,000
Amortization of prior service credits (125,000) (124,000) (248,000) (248,000)
Amortization of net loss 45,000 44,000 87,000 87,000
Net periodic benefit credit (31,000) (40,000) (62,000) (80,000)
Total post-retirement benefits expense 609,000 $ 508,000 1,150,000 $ 959,000
Pension Plan        
Pension, health and life insurance expense:        
Payments made to pension plans     1,525,000  
Pension plan payments expected to be made in fiscal year 1,506,000   1,506,000  
Pension plan payments accrued 630,000   630,000  
Other Postretirement Benefits Plan        
Pension, health and life insurance expense:        
Payments for post retirement healthcare and life insurance     66,000  
Pension plan payments expected to be made in fiscal year 1,325,000   1,325,000  
Pension plan payments accrued $ 1,325,000   $ 1,325,000