Annual report pursuant to Section 13 and 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 ($)
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 9,653,000 $ 13,493,000
Gross Unrealized Gains 4,000 3,000
Gross Unrealized Losses (1,000) (30,000)
Fair Value 9,656,000 13,466,000
Cash Equivalents 3,851,000 1,944,000
Short-Term Investments 5,805,276 5,228,668
Long-Term Investments   6,293,505
Cash Equivalents [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,851,000 1,944,000
Fair Value 3,851,000 1,944,000
Cash Equivalents 3,851,000 1,944,000
Cash Equivalents [Member] | Money Market Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,851,000 1,944,000
Fair Value 3,851,000 1,944,000
Cash Equivalents 3,851,000 1,944,000
Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,802,000 11,549,000
Gross Unrealized Gains 4,000 3,000
Gross Unrealized Losses (1,000) (30,000)
Fair Value 5,805,000 11,522,000
Short-Term Investments 5,805,000 5,229,000
Long-Term Investments   6,293,000
Investments [Member] | Certificates Of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,291,000 5,493,000
Gross Unrealized Gains 4,000 3,000
Gross Unrealized Losses (1,000) (8,000)
Fair Value 4,294,000 5,488,000
Short-Term Investments 4,294,000 1,202,000
Long-Term Investments   4,286,000
Investments [Member] | Corporate Notes/Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,511,000 6,056,000
Gross Unrealized Losses   (22,000)
Fair Value 1,511,000 6,034,000
Short-Term Investments $ 1,511,000 4,027,000
Long-Term Investments   $ 2,007,000