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Investments (Cost And Estimated Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 2,034 | $ 3,054
Gross unrealized gain | 2 | 2
Gross unrealized loss | 0 | 0
Fair value | 2,036 | 3,056
Less cash equivalents, Carrying amount | 7,646 | 6,713
Commercial Paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 1,377 | 1,520
Gross unrealized gain | 0 | 0
Gross unrealized loss | 0 | 0
Fair value | 1,377 | 1,520
Treasury Bills [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 7,922 | 8,000
Gross unrealized gain | 32 | 0
Gross unrealized loss | 0 | 0
Fair value | 7,954 | 8,000
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 | 9,353 | 9,574
Gross unrealized gain | 34 | 2
Gross unrealized loss | 0 | 0
Fair value | 9,387 | 9,576
Less Cash Equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized gain | 32 | 0
Gross unrealized loss | 0 | 0
Less cash equivalents, Carrying amount | 7,319 | 6,520
Less cash equivalents, Fair value | $ 7,351 | $ 6,520

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