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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
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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)

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