Summary Of Significant Accounting Policies (Schedule Of Amounts Reclassified Out Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of period	$ (8,211)	$ (8,253)	$ (11,976)	$ (12,070)	$ (8,253)	$ (12,070)
Total other comprehensive income, before tax	54		122		109	245
Total tax expense	(13)	(13)	(28)	(29)	(26)	(57)
Other comprehensive income, net of tax	41	42	94	94	83	188
Accumulated other comprehensive loss at end of period	(8,170)	$ (8,211)	(11,882)	$ (11,976)	(8,170)	(11,882)
Defined Benefit Pension Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	107		173		214	346
Postretirement Benefit Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	(7)		(5)		(14)	(10)
Amortization of prior service credit	$ (46)		$ (46)		$ (91)	$ (91)