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, 2022	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of period	$ (11,077)	$ (11,172)	$ (8,211)	$ (8,253)	$ (11,172)	$ (8,253)
Total other comprehensive income, before tax	125		54		249	109
Total tax expense	(30)	(29)	(13)	(13)	(59)	(26)
Other comprehensive income, net of tax	95	95	41	42	190	83
Accumulated other comprehensive loss at end of period	(10,982)	$ (11,077)	(8,170)	$ (8,211)	(10,982)	(8,170)
Defined Benefit Pension Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	182		107		363	214
Postretirement Benefit Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	(11)		(7)		(23)	(14)
Amortization of prior service credit	$ (46)		$ (46)		$ (91)	$ (91)