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, 2024	Dec. 31, 2023	Sep. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Mar. 31, 2024	Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of period	$ (9,214)		$ (9,365)	$ (10,982)		$ (11,172)	$ (9,365)	$ (11,172)
Total other comprehensive income, before tax	98			125			295	374
Total tax expense	(23)	$ (23)	(23)	(28)	$ (30)	(29)	(69)	(87)
Other comprehensive income, net of tax	75	75	$ 76	97	95	$ 95	226	287
Accumulated other comprehensive loss at end of period	(9,139)	$ (9,214)		(10,885)	$ (10,982)		(9,139)	(10,885)
Defined Benefit Pension Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	158			181			475	544
Postretirement Benefit Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	(15)			(11)			(45)	(34)
Amortization of prior service credit	$ (45)			$ (45)			$ (135)	$ (136)