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Investments (Cost And Estimated Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | $ 45 | $ 7,701 |
Gross unrealized gain | 0 | 41 |
Gross unrealized loss | 0 | 0 |
Fair value, investments | 45 | 7,742 |
Less cash equivalents, Carrying amount | 8,785 | 1,057 | $ 963
Commercial Paper [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 797 | 667 |
Gross unrealized gain | 0 | 0 |
Gross unrealized loss | 0 | 0 |
Fair value, investments | 797 | 667 |
Treasury Bills [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 7,734 | 7,656 |
Gross unrealized gain | 0 | 41 |
Gross unrealized loss | 0 | 0 |
Fair value, investments | 7,734 | 7,697 |
Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 45 | 45 |
Gross unrealized gain | 0 | 0 |
Gross unrealized loss | 0 | 0 |
Fair value, investments | 45 | 45 |
Debt and Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 8,576 | 8,368 |
Gross unrealized gain | 0 | 41 |
Gross unrealized loss | 0 | 0 |
Fair value, investments | 8,576 | 8,409 |
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 | 8,531 | 667 |
Less cash equivalents, Fair value | $ 8,531 | $ 667 |

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