Quarterly report pursuant to Section 13 or 15(d)

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

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Cash Equivalents And Investments (Schedule Of Cash Equivalents And Available-For-Sale Securities) (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 9,711,000 $ 9,653,000
Gross Unrealized Gains   4,000
Gross Unrealized Losses   (1,000)
Fair Value 9,711,000 9,656,000
Cash Equivalents 8,986,000 3,851,000
Short-Term Investments 725,112 5,805,276
Cash Equivalents [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 8,986,000 3,851,000
Fair Value 8,986,000 3,851,000
Cash Equivalents 8,986,000 3,851,000
Cash Equivalents [Member] | Money Market Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 8,986,000 3,851,000
Fair Value 8,986,000 3,851,000
Cash Equivalents 8,986,000 3,851,000
Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 725,000 5,802,000
Gross Unrealized Gains   4,000
Gross Unrealized Losses   (1,000)
Fair Value 725,000 5,805,000
Short-Term Investments 725,000 5,805,000
Investments [Member] | Certificates Of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 725,000 4,291,000
Gross Unrealized Gains   4,000
Gross Unrealized Losses   (1,000)
Fair Value 725,000 4,294,000
Short-Term Investments $ 725,000 4,294,000
Investments [Member] | Corporate Notes/Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   1,511,000
Fair Value   1,511,000
Short-Term Investments   $ 1,511,000