Quarterly report pursuant to Section 13 or 15(d)

Cash Equivalents And Investments (Schedule Of Estimated Fair Value Of Available-For-Sale Securities) (Details)

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Cash Equivalents And Investments (Schedule Of Estimated Fair Value Of Available-For-Sale Securities) (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Fair Value $ 9,642,000 $ 13,466,000
Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Due within one year 8,810,000  
Amortized Cost, Due after one year through five years 725,000  
Amortized Cost 9,535,000  
Fair Value, Due within one year 8,816,000  
Fair Value, Due after one year through five years 728,000  
Fair Value $ 9,544,000 $ 11,522,000