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Investments (Cost And Estimated Fair Value Of Investments) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]      
Cost $ 5,312,000 $ 5,341,000  
Gross unrealized gain 2,687,000 3,639,000  
Gross unrealized loss 54,000 55,000  
Fair value, investments 7,945,000 8,925,000  
Less cash equivalents, Carrying amount 1,505,000 1,102,000 5,476,000
Money Market [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Cost 540,000 804,000  
Gross unrealized gain 0 0  
Gross unrealized loss 0 0  
Fair value, investments 540,000 804,000  
Commercial Paper [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Cost 601,000 200,000  
Gross unrealized gain 0 0  
Gross unrealized loss 0 0  
Fair value, investments 601,000 200,000  
Treasury Bills [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Cost 5,226,000 5,249,000  
Gross unrealized gain 1,000 0  
Gross unrealized loss 0 1,000  
Fair value, investments 5,227,000 5,248,000  
Equity Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Cost 86,000 92,000  
Gross unrealized gain 2,686,000 3,639,000  
Gross unrealized loss 54,000 54,000  
Fair value, investments 2,718,000 3,677,000  
Debt and Equity Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Cost 6,453,000 6,345,000  
Gross unrealized gain 2,687,000 3,639,000  
Gross unrealized loss 54,000 55,000  
Fair value, investments 9,086,000 9,929,000  
Less Cash Equivalents [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Gross unrealized gain 0 0  
Gross unrealized loss 0 0  
Less cash equivalents, Carrying amount 1,141,000 1,004,000  
Less cash equivalents, Fair value $ 1,141,000 $ 1,004,000