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, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss at beginning of period	$ (10,238)	$ (10,308)	$ (8,215)	$ (8,259)	$ (10,308)	$ (8,259)
Total other comprehensive income, before tax	91		57		182	114
Total tax expense	(22)	(21)	(14)	(13)	(43)	(27)
Other comprehensive income, net of tax	69	70	43	44	139	87
Accumulated other comprehensive loss at end of period	(10,169)	$ (10,238)	(8,172)	$ (8,215)	(10,169)	(8,172)
Defined Benefit Pension Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	143		112		286	224
Postretirement Benefit Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrecognized net (gain) loss	(6)		(10)		(13)	(19)
Amortization of prior service credit	$ (46)		$ (45)		$ (91)	$ (91)