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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2017
Pension, health and life insurance expense:      
Multi-employer plan contributions $ 157,000 $ 187,000  
Defined contribution plan contributions 207,000 218,000  
Total pension expense 364,000 405,000  
Interest cost 75,000 81,000  
Amortization of prior service costs (124,000) (124,000)  
Amortization of net loss 37,000 39,000  
Net periodic benefit cost (12,000) (4,000)  
Total post retirement benefits expense 352,000 $ 401,000  
Payments to pension plans 216,000    
Payments for post retirement healthcare and life insurance 90,000    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Accrued Expected Pension Plan Payments $ 629,000    
Scenario, Forecast [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expected payments to pension plans     $ 1,170,000
Expected future payments for other post retirement benefits     $ 928,000