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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2018
Pension, health and life insurance expense:          
Multi-employer plan contributions $ 185,000 $ 169,000 $ 363,000 $ 326,000  
Defined contribution plan contributions 286,000 188,000 545,000 395,000  
Total pension expense 471,000 357,000 908,000 721,000  
Interest cost 69,000 74,000 138,000 149,000  
Amortization of prior service costs (124,000) (124,000) (248,000) (248,000)  
Amortization of net loss 43,000 38,000 86,000 75,000  
Net periodic benefit cost (12,000) (12,000) (24,000) (24,000)  
Total post retirement benefits expense 459,000 $ 345,000 884,000 $ 697,000  
Payments to pension plans     618,000    
Payments for post retirement healthcare and life insurance     181,000    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Accrued Expected Pension Plan Payments $ 601,000   $ 601,000    
Scenario, Forecast [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Expected payments to pension plans         $ 1,193,000
Expected future payments for other post retirement benefits         $ 915,000