Quarterly report pursuant to Section 13 or 15(d)

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

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Cash Equivalents And Investments (Schedule Of Available-For-Sale Securities) (Details) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 14,964,000 $ 17,264,000
Gross Unrealized Gains 11,000 7,000
Gross Unrealized Losses (10,000) (55,000)
Fair Value 14,965,000 17,216,000
Cash Equivalents 2,222,000 1,073,000
Short-Term Investments 2,685,691 4,602,717
Long-Term Investments 10,056,996 11,540,261
Cash and Cash Equivalents [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,222,000 1,073,000
Fair Value 2,222,000 1,073,000
Cash Equivalents 2,222,000 1,073,000
Cash and Cash Equivalents [Member] | Money Market Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,222,000 1,073,000
Fair Value 2,222,000 1,073,000
Cash Equivalents 2,222,000 1,073,000
Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 12,742,000 16,191,000
Gross Unrealized Gains 11,000 7,000
Gross Unrealized Losses (10,000) (55,000)
Fair Value 12,743,000 16,143,000
Short-Term Investments 2,686,000 4,603,000
Long-Term Investments 10,057,000 11,540,000
Investments [Member] | Certificates Of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,972,000 7,414,000
Gross Unrealized Gains 10,000 1,000
Gross Unrealized Losses (3,000) (32,000)
Fair Value 5,979,000 7,383,000
Short-Term Investments 962,000 1,920,000
Long-Term Investments 5,017,000 5,463,000
Investments [Member] | Corporate Notes/Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 6,770,000 8,777,000
Gross Unrealized Gains 1,000 6,000
Gross Unrealized Losses (7,000) (23,000)
Fair Value 6,764,000 8,760,000
Short-Term Investments 1,724,000 2,683,000
Long-Term Investments $ 5,040,000 $ 6,077,000