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Investments (Cost And Estimated Fair Value Of Investments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Investments    
Cost $ 4,009 $ 2,034
Cash equivalents, Carrying amount 5,540 7,646
Gross unrealized gain 14 2
Gross unrealized loss 0 0
Fair value, investments 4,023 2,036
Money Market Savings [Member]    
Investments    
Cost 1,316  
Gross unrealized gain 0  
Gross unrealized loss 0  
Fair value, investments 1,316  
Commercial Paper [Member]    
Investments    
Cost   1,377
Gross unrealized gain   0
Gross unrealized loss   0
Fair value, investments   1,377
Treasury Bills [Member]    
Investments    
Cost 7,914 7,922
Gross unrealized gain 39 32
Gross unrealized loss 0 0
Fair value, investments 7,953 7,954
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 9,284 9,353
Gross unrealized gain 41 34
Gross unrealized loss 0 0
Fair value, investments 9,325 9,387
Less Cash Equivalents [Member]    
Investments    
Cash equivalents, Carrying amount 5,275 7,319
Gross unrealized gain 27 32
Gross unrealized loss 0 0
Cash equivalents, Fair value $ 5,302 $ 7,351