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, 2023	Dec. 31, 2022	Sep. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Mar. 31, 2023	Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of period	$ (10,982)		$ (11,172)	$ (8,170)		$ (8,253)	$ (11,172)	$ (8,253)
Total other comprehensive income, before tax	125			56			374	165
Total tax expense	(28)	$ (30)	(29)	(13)	$ (13)	(13)	(87)	(39)
Other comprehensive income, net of tax	97	95	$ 95	43	41	$ 42	287	126
Accumulated other comprehensive loss at end of period	(10,885)	$ (10,982)		(8,127)	$ (8,170)		(10,885)	(8,127)
Defined Benefit Pension Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	181			107			544	321
Postretirement Benefit Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	(11)			(6)			(34)	(20)
Amortization of prior service credit	$ (45)			$ (45)			$ (136)	$ (136)