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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2019
Pension, health and life insurance expense:      
Multi-employer plan contributions $ 231,000 $ 178,000  
Defined contribution plan contributions 261,000 259,000  
Total pension expense 492,000 437,000  
Interest cost 71,000 69,000  
Amortization of prior service costs (124,000) (124,000)  
Amortization of net loss 29,000 43,000  
Net periodic benefit cost (24,000) (12,000)  
Total post retirement benefits expense 468,000 $ 425,000  
Payments to pension plans 342,000    
Payments for post retirement healthcare and life insurance 84,000    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Accrued Expected Pension Plan Payments $ 710,000    
Scenario, Forecast [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expected payments to pension plans     $ 1,628,000
Expected future payments for other post retirement benefits     $ 1,073,000