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 ($)
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 15,933,000 $ 17,264,000
Gross Unrealized Gains 14,000 7,000
Gross Unrealized Losses (13,000) (55,000)
Fair Value 15,934,000 17,216,000
Cash Equivalents 2,473,000 1,073,000
Short-Term Investments 2,884,792 4,602,717
Long-Term Investments 10,576,393 11,540,261
Cash and Cash Equivalents [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,473,000 1,073,000
Fair Value 2,473,000 1,073,000
Cash Equivalents 2,473,000 1,073,000
Cash and Cash Equivalents [Member] | Money Market Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,473,000 1,073,000
Fair Value 2,473,000 1,073,000
Cash Equivalents 2,473,000 1,073,000
Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 13,460,000 16,191,000
Gross Unrealized Gains 14,000 7,000
Gross Unrealized Losses (13,000) (55,000)
Fair Value 13,461,000 16,143,000
Short-Term Investments 2,885,000 4,603,000
Long-Term Investments 10,576,000 11,540,000
Investments [Member] | Certificates Of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,973,000 7,414,000
Gross Unrealized Gains 12,000 1,000
Gross Unrealized Losses (1,000) (32,000)
Fair Value 5,984,000 7,383,000
Short-Term Investments 962,000 1,920,000
Long-Term Investments 5,022,000 5,463,000
Investments [Member] | Corporate Notes/Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 7,487,000 8,777,000
Gross Unrealized Gains 2,000 6,000
Gross Unrealized Losses (12,000) (23,000)
Fair Value 7,477,000 8,760,000
Short-Term Investments 1,923,000 2,683,000
Long-Term Investments $ 5,554,000 $ 6,077,000