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Investments (Cost And Estimated Fair Value Of Investments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Investments    
Cost $ 3,048 $ 3,054
Gross unrealized gain 4 2
Gross unrealized loss 0 0
Fair value, investments 3,052 3,056
Cash equivalents, Carrying amount 6,429 6,713
Commercial Paper [Member]    
Investments    
Cost 1,141 1,520
Gross unrealized gain 0 0
Gross unrealized loss 0 0
Fair value, investments 1,141 1,520
Treasury Bills [Member]    
Investments    
Cost 7,983 8,000
Gross unrealized gain 6 0
Gross unrealized loss 0 0
Fair value, investments 7,989 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 9,178 9,574
Gross unrealized gain 8 2
Gross unrealized loss 0 0
Fair value, investments 9,186 9,576
Less Cash Equivalents [Member]    
Investments    
Gross unrealized gain 4 0
Gross unrealized loss 0 0
Cash equivalents, Carrying amount 6,130 6,520
Cash equivalents, Fair value $ 6,134 $ 6,520