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Benefit Plans 3 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Pension Benefits [Member]      
Net periodic costs      
Service cost $ 45 $ 124 $ 126
Interest cost 698 729 687
Expected return on plan assets (532) (472) (460)
Recognized net actuarial loss (gain) 185 424 872
Amortization of prior service cost 0 27 86
Recognition of prior service cost upon plan curtailment 0 (8) 0
Net periodic cost (benefits) 396 840 1,311
Postretirement Health Coverage [Member]      
Net periodic costs      
Service cost 18 19 29
Interest cost 54 52 63
Expected return on plan assets 0 0 0
Recognized net actuarial loss (gain) (121) (154) (181)
Amortization of prior service cost (369) (369) (271)
Recognition of prior service cost upon plan curtailment 0 0 0
Net periodic cost (benefits) $ (418) $ (452) $ (360)