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, 2022	Dec. 31, 2021	Sep. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2022	Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of period	$ (8,170)		$ (8,253)	$ (11,882)		$ (12,070)	$ (8,253)	$ (12,070)
Total other comprehensive income, before tax	56			122			165	367
Total tax expense	(13)	$ (13)	(13)	(28)	$ (28)	(29)	(39)	(85)
Other comprehensive income, net of tax	43	41	$ 42	94	94	$ 94	126	282
Accumulated other comprehensive loss at end of period	(8,127)	$ (8,170)		(11,788)	$ (11,882)		(8,127)	(11,788)
Defined Benefit Pension Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	107			172			321	518
Postretirement Benefit Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	(6)			(5)			(20)	(15)
Amortization of prior service credit	$ (45)			$ (45)			$ (136)	$ (136)