Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities (Schedule Of Cost And Fair Value Of Cash, Cash Equivalents, And Marketable Securities) (Details)

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Marketable Securities (Schedule Of Cost And Fair Value Of Cash, Cash Equivalents, And Marketable Securities) (Details) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Cost Basis $ 16,007,623 $ 22,905,698
Gross Unrealized Gains 7,376 122
Gross Unrealized Losses (1,628) (33,769)
Fair value 16,013,371 22,872,051
Commercial Paper [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost Basis 999,842 1,998,001
Gross Unrealized Gains 88 62
Gross Unrealized Losses   (153)
Fair value 999,930 1,997,910
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost Basis 2,527,781 2,042,697
Gross Unrealized Gains 69  
Gross Unrealized Losses (1,585) (6,827)
Fair value 2,526,265 2,035,870
Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost Basis 12,480,000 18,865,000
Gross Unrealized Gains 7,219 60
Gross Unrealized Losses (43) (26,789)
Fair value $ 12,487,176 $ 18,838,271