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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Pension, health and life insurance expense:        
Multi-employer plan $ 118,000 $ 211,000 $ 248,000 $ 425,000
Defined contribution plan 411,000 432,000 877,000 938,000
Total pension expense 529,000 643,000 1,125,000 1,363,000
Interest cost 29,000 23,000 60,000 46,000
Amortization of prior service credits (124,000) (124,000) (248,000) (248,000)
Amortization of net gain (22,000) (37,000) (39,000) (74,000)
Net periodic benefit credit (117,000) (138,000) (227,000) (276,000)
Total post-retirement benefits expense 412,000 $ 505,000 898,000 $ 1,087,000
Pension Plan        
Pension, health and life insurance expense:        
Payments made to pension plans     1,242,000  
Pension plan payments expected to be made in fiscal year 721,000   721,000  
Pension plan payments accrued 128,000   128,000  
Other Postretirement Benefits Plan        
Pension, health and life insurance expense:        
Payments for post retirement healthcare and life insurance     61,000  
Pension plan payments expected to be made in fiscal year 73,000   73,000  
Pension plan payments accrued $ 73,000   $ 73,000