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Investments (Cost And Estimated Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | $ 7,701 | $ 7,741 |
Gross unrealized gain | 41 | 24 |
Gross unrealized loss | 0 | (9) |
Fair value, investments | 7,742 | 7,756 |
Less cash equivalents, Carrying amount | 1,057 | 963 | $ 840
Commercial Paper [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 667 | 568 |
Gross unrealized gain | 0 | 0 |
Gross unrealized loss | 0 | 0 |
Fair value, investments | 667 | 568 |
Treasury Bills [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 7,656 | 7,687 |
Gross unrealized gain | 41 | 24 |
Gross unrealized loss | 0 | 0 |
Fair value, investments | 7,697 | 7,711 |
Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 45 | 54 |
Gross unrealized gain | 0 | 0 |
Gross unrealized loss | 0 | (9) |
Fair value, investments | 45 | 45 |
Debt and Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 8,368 | 8,309 |
Gross unrealized gain | 41 | 24 |
Gross unrealized loss | 0 | (9) |
Fair value, investments | 8,409 | 8,324 |
Less Cash Equivalents [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized gain | 0 | 0 |
Gross unrealized loss | 0 | 0 |
Less cash equivalents, Carrying amount | 667 | 568 |
Less cash equivalents, Fair value | $ 667 | $ 568 |

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