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Post Retirement Benefits (Details) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2020
Pension, health and life insurance expense:      
Multiemployer Plan, Employer Contribution, Cost $ 246,000 $ 231,000  
Defined contribution plan contributions 293,000 261,000  
Total pension expense 539,000 492,000  
Interest cost 59,000 71,000  
Amortization of prior service costs (124,000) (124,000)  
Amortization of net loss 45,000 29,000  
Net periodic benefit cost (20,000) (24,000)  
Total post retirement benefits expense 519,000 $ 468,000  
Payments to pension plans 262,000    
Payments for post retirement healthcare and life insurance 73,000    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Accrued Expected Pension Plan Payments $ 842,000    
Forecast [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expected payments to pension plans     $ 1,736,000
Expected future payments for other post retirement benefits     $ 1,160,000