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Post Retirement Benefits (Details) - USD ($)
 2 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Pension, health and life insurance expense:          
Multi-employer plan contributions   $ 186,000 $ 153,000 $ 549,000 $ 479,000
Defined contribution plan contributions   182,000 162,000 698,000 557,000
Total pension expense   368,000 315,000 1,247,000 1,036,000
Interest cost   69,000 75,000 207,000 224,000
Amortization of prior service costs   (124,000) (124,000) (372,000) (372,000)
Amortization of net loss   43,000 37,000 129,000 112,000
Net periodic benefit cost   (12,000) (12,000) (36,000) (36,000)
Total post retirement benefits expense   356,000 $ 303,000 1,211,000 $ 1,000,000
Payments to pension plans       1,392,000  
Payments for post retirement healthcare and life insurance       238,000  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Accrued Expected Pension Plan Payments   $ 92,000   $ 92,000  
Scenario, Forecast [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Expected payments to pension plans $ 300,000        
Expected future payments for other post retirement benefits $ 858,000