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Investments (Cost And Estimated Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 54 | $ 2,034
Gross unrealized gain | 2 | 2
Gross unrealized loss | 0 | 0
Fair value | 56 | 2,036
Less cash equivalents, Carrying amount | 9,870 | 7,646
Money Market [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 1,902 |
Gross unrealized gain | 0 |
Gross unrealized loss | 0 |
Fair value | 1,902 |
Commercial Paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | 1,377
Gross unrealized gain |  | 0
Gross unrealized loss |  | 0
Fair value |  | 1,377
Treasury Bills [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 7,900 | 7,922
Gross unrealized gain | 26 | 32
Gross unrealized loss | 0 | 0
Fair value | 7,926 | 7,954
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 54 | 54
Gross unrealized gain | 2 | 2
Gross unrealized loss | 0 | 0
Fair value | 56 | 56
Debt and Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 9,856 | 9,353
Gross unrealized gain | 28 | 34
Gross unrealized loss | 0 | 0
Fair value | 9,884 | 9,387
Less Cash Equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized gain | 26 | 32
Gross unrealized loss | 0 | 0
Less cash equivalents, Carrying amount | 9,802 | 7,319
Less cash equivalents, Fair value | $ 9,828 | $ 7,351

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