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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Pension, health and life insurance expense:          
Multi-employer plan contributions   $ 270,000 $ 186,000 $ 732,000 $ 549,000
Defined contribution plan contributions   364,000 182,000 950,000 698,000
Total pension expense   634,000 368,000 1,682,000 1,247,000
Interest cost   72,000 69,000 216,000 207,000
Amortization of prior service costs   (125,000) (124,000) (375,000) (372,000)
Amortization of net loss   30,000 43,000 88,000 129,000
Net periodic benefit cost   (23,000) (12,000) (71,000) (36,000)
Total post retirement benefits expense   611,000 $ 356,000 1,611,000 $ 1,211,000
Payments to pension plans       1,682,000  
Payments for post retirement healthcare and life insurance       224,000  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Accrued Expected Pension Plan Payments   $ 150,000   $ 150,000  
Scenario, Forecast [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Expected payments to pension plans $ 394,000        
Expected future payments for other post retirement benefits $ 933,000