XML 27 R19.htm IDEA: XBRL DOCUMENT v3.23.2
Investments (Cost And Estimated Fair Value Of Investments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Investments    
Cost $ 4,005 $ 2,034
Cash equivalents, Carrying amount 5,600 7,646
Gross unrealized gain 24 2
Gross unrealized loss 0 0
Fair value, investments 4,029 2,036
Money Market Savings [Member]    
Investments    
Cost 1,434  
Gross unrealized gain 0  
Gross unrealized loss 0  
Fair value, investments 1,434  
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 7,904 7,922
Gross unrealized gain 43 32
Gross unrealized loss 0 0
Fair value, investments 7,947 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 9,392 9,353
Gross unrealized gain 45 34
Gross unrealized loss 0 0
Fair value, investments 9,437 9,387
Less Cash Equivalents [Member]    
Investments    
Cash equivalents, Carrying amount 5,387 7,319
Gross unrealized gain 21 32
Gross unrealized loss 0 0
Cash equivalents, Fair value $ 5,408 $ 7,351