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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Pension, health and life insurance expense:          
Multi-employer plan contributions   $ 218,000 $ 178,000 $ 646,000 $ 514,000
Defined contribution plan contributions   222,000 169,000 629,000 530,000
Total pension expense   440,000 347,000 1,275,000 1,044,000
Interest cost   79,000 69,000 237,000 207,000
Amortization of prior service costs   (124,000) (124,000) (372,000) (372,000)
Amortization of net loss   42,000 12,000 126,000 36,000
Net periodic benefit cost   (3,000) (43,000) (9,000) (129,000)
Total post retirement benefits expense   437,000 $ 304,000 1,266,000 $ 915,000
Payments to pension plans       1,322,000  
Payments for post retirement healthcare and life insurance       $ 350,000  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Document Fiscal Year Focus       2015  
Accrued Expected Pension Plan Payments   $ 67,000   $ 67,000  
Scenario, Forecast [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Expected payments to pension plans $ 252,000        
Expected future payments for other post retirement benefits $ 150,000