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, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 13,493,000 $ 17,264,000
Gross Unrealized Gains 3,000 7,000
Gross Unrealized Losses (30,000) (55,000)
Fair Value 13,466,000 17,216,000
Cash Equivalents 1,944,000 1,073,000
Short-Term Investments 5,228,668 4,602,717
Long-Term Investments 6,293,505 11,540,261
Cash Equivalents [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,944,000 1,073,000
Fair Value 1,944,000 1,073,000
Cash Equivalents 1,944,000 1,073,000
Cash Equivalents [Member] | Money Market Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,944,000 1,073,000
Fair Value 1,944,000 1,073,000
Cash Equivalents 1,944,000 1,073,000
Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 11,549,000 16,191,000
Gross Unrealized Gains 3,000 7,000
Gross Unrealized Losses (30,000) (55,000)
Fair Value 11,522,000 16,143,000
Short-Term Investments 5,229,000 4,603,000
Long-Term Investments 6,293,000 11,540,000
Investments [Member] | Certificates Of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,493,000 7,414,000
Gross Unrealized Gains 3,000 1,000
Gross Unrealized Losses (8,000) (32,000)
Fair Value 5,488,000 7,383,000
Short-Term Investments 1,202,000 1,920,000
Long-Term Investments 4,286,000 5,463,000
Investments [Member] | Corporate Notes/Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 6,056,000 8,777,000
Gross Unrealized Gains   6,000
Gross Unrealized Losses (22,000) (23,000)
Fair Value 6,034,000 8,760,000
Short-Term Investments 4,027,000 2,683,000
Long-Term Investments $ 2,007,000 $ 6,077,000