Quarterly report pursuant to Section 13 or 15(d)

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

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Cash Equivalents And Investments (Schedule Of Cash And Available-For-Sale Securities) (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 12,771,000 $ 13,493,000
Gross Unrealized Gains 13,000 3,000
Gross Unrealized Losses (2,000) (30,000)
Fair Value 12,782,000 13,466,000
Cash Equivalents 2,480,000 1,944,000
Short-Term Investments 7,931,517 5,228,668
Long-Term Investments 2,370,335 6,293,505
Cash Equivalents [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,480,000 1,944,000
Fair Value 2,480,000 1,944,000
Cash Equivalents 2,480,000 1,944,000
Cash Equivalents [Member] | Money Market Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,480,000 1,944,000
Fair Value 2,480,000 1,944,000
Cash Equivalents 2,480,000 1,944,000
Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 10,291,000 11,549,000
Gross Unrealized Gains 13,000 3,000
Gross Unrealized Losses (2,000) (30,000)
Fair Value 10,302,000 11,522,000
Short-Term Investments 7,932,000 5,229,000
Long-Term Investments 2,370,000 6,293,000
Investments [Member] | Certificates Of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,251,000 5,493,000
Gross Unrealized Gains 11,000 3,000
Gross Unrealized Losses (1,000) (8,000)
Fair Value 5,261,000 5,488,000
Short-Term Investments 2,891,000 1,202,000
Long-Term Investments 2,370,000 4,286,000
Investments [Member] | Corporate Notes/Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,040,000 6,056,000
Gross Unrealized Gains 2,000  
Gross Unrealized Losses (1,000) (22,000)
Fair Value 5,041,000 6,034,000
Short-Term Investments $ 5,041,000 4,027,000
Long-Term Investments   $ 2,007,000