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Investments (Cost And Estimated Fair Value Of Investments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Investments    
Cost $ 54 $ 3,054
Cash equivalents, Carrying amount 9,518 6,713
Gross unrealized gain 2 2
Gross unrealized loss 0 0
Fair value, investments 56 3,056
Commercial Paper [Member]    
Investments    
Cost 1,198 1,520
Gross unrealized gain 0 0
Gross unrealized loss 0 0
Fair value, investments 1,198 1,520
Treasury Bills [Member]    
Investments    
Cost 7,956 8,000
Gross unrealized gain 10 0
Gross unrealized loss 0 0
Fair value, investments 7,966 8,000
Equity Securities [Member]    
Investments    
Cost 54 54
Gross unrealized gain 2 2
Gross unrealized loss 0 0
Fair value, investments 56 56
Debt and Equity Securities [Member]    
Investments    
Cost 9,208 9,574
Gross unrealized gain 12 2
Gross unrealized loss 0 0
Fair value, investments 9,220 9,576
Less Cash Equivalents [Member]    
Investments    
Cash equivalents, Carrying amount 9,154 6,520
Gross unrealized gain 10 0
Gross unrealized loss 0 0
Cash equivalents, Fair value $ 9,164 $ 6,520