Summary Of Significant Accounting Policies (Schedule Of Amounts Reclassified Out Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2020	Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of period	$ (10,169)		$ (10,308)	$ (8,172)		$ (8,259)	$ (10,308)	$ (8,259)
Total other comprehensive income, before tax	91			56			273	170
Total tax expense	(21)	$ (22)	(21)	(13)	$ (14)	(13)	(64)	(40)
Other comprehensive income, net of tax	70	69	$ 70	43	43	$ 44	209	130
Accumulated other comprehensive loss at end of period	(10,099)	$ (10,169)		(8,129)	$ (8,172)		(10,099)	(8,129)
Defined Benefit Pension Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	143			111			429	335
Postretirement Benefit Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	(7)			(9)			(20)	(28)
Amortization of prior service credit	$ (45)			$ (46)			$ (136)	$ (137)