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Benefit Plans 3 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Pension Benefits [Member]      
Net periodic costs      
Service cost $ 124 $ 126 $ 91
Interest cost 729 687 879
Expected return on plan assets (472) (460) (491)
Recognized net actuarial loss (gain) 424 872 913
Amortization of prior service cost 27 86 86
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment (8) 0 0
Net periodic cost (benefits) 840 1,311 1,478
Postretirement Health Coverage [Member]      
Net periodic costs      
Service cost 19 29 22
Interest cost 52 63 75
Expected return on plan assets 0 0 0
Recognized net actuarial loss (gain) (154) (181) (210)
Amortization of prior service cost (369) (271) (271)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 0 0 0
Net periodic cost (benefits) $ (452) $ (360) $ (384)