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Investments (Cost And Estimated Fair Value Of Investments) (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Cost $ 101,000 $ 101,000    
Gross unrealized gain 2,949,000 3,134,000    
Gross unrealized losses (54,000) (54,000)    
Fair value, Available for Sale Securities 2,996,000 3,181,000    
Cash and cash equivalents, Carrying amount 5,634,000 5,476,000 490,000 583,000
Commercial Paper [Member]
        
Cost 5,447,000 5,373,000    
Gross unrealized gain 0 0    
Gross unrealized losses 0 0    
Fair value, Available for Sale Securities 5,447,000 5,373,000    
Equity Securities [Member]
        
Cost 101,000 101,000    
Gross unrealized gain 2,949,000 3,134,000    
Gross unrealized losses (54,000) (54,000)    
Fair value, Available for Sale Securities 2,996,000 3,181,000    
Commercial Paper And Equity Securities [Member]
        
Cost 5,548,000 5,474,000    
Gross unrealized gain 2,949,000 3,134,000    
Gross unrealized losses (54,000) (54,000)    
Fair value, Available for Sale Securities 8,443,000 8,554,000    
Less Cash and Cash Equivalents [Member]
        
Gross unrealized gain 0 0    
Gross unrealized losses 0 0    
Cash and cash equivalents, Carrying amount 5,447,000 5,373,000    
Cash and Cash Equivalents, Fair value $ 5,447,000 $ 5,373,000