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, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of period	$ (8,172)		$ (8,259)	$ (8,825)		$ (8,936)	$ (8,259)	$ (8,936)
Total other comprehensive income, before tax	56			89			170	266
Total tax expense	(13)	$ (14)	(13)	(27)	$ (33)	(33)	(40)	(93)
Other comprehensive income, net of tax	43	43	$ 44	62	55	$ 56	130	173
Tax Cuts and Jobs Act of 2017, Reclassification from accumulated other comprehensive loss to retained earnings	0			(1,889)			0	(1,889)
Accumulated other comprehensive loss at end of period	(8,129)	$ (8,172)		(10,652)	$ (8,825)		(8,129)	(10,652)
Defined Benefit Pension Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	111			143			335	429
Postretirement Benefit Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	(9)			(9)			(28)	(27)
Amortization of prior service credit	$ (46)			$ (45)			$ (137)	$ (136)