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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2016
Pension, health and life insurance expense:      
Multi-employer plan contributions $ 187,000 $ 211,000  
Defined contribution plan contributions 218,000 234,000  
Total pension expense 405,000 445,000  
Interest cost 81,000 79,000  
Amortization of prior service costs (124,000) (124,000)  
Amortization of net loss 39,000 42,000  
Net periodic benefit cost (4,000) (3,000)  
Total post retirement benefits expense 401,000 $ 442,000  
Payments to pension plans 249,000    
Payments for post retirement healthcare and life insurance 65,000    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Accrued Expected Pension Plan Payments $ 643,000    
Scenario, Forecast [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expected payments to pension plans     $ 1,249,000
Expected future payments for other post retirement benefits     $ 1,023,000