Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities (Schedule Of Cost And Fair Value Of Marketable Securities) (Details)

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Marketable Securities (Schedule Of Cost And Fair Value Of Marketable Securities) (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Cost Basis $ 13,424,015 $ 13,258,127
Gross Unrealized Gains 1,385 571
Gross Unrealized Losses (6,041) (18,612)
Fair value 13,419,359 13,240,086
Commercial Paper [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost Basis 5,974,806 2,981,307
Gross Unrealized Gains 406  
Gross Unrealized Losses (1,152) (3,737)
Fair value 5,974,060 2,977,570
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost Basis 5,049,209 4,036,820
Gross Unrealized Losses (4,889) (9,300)
Fair value 5,044,320 4,027,520
Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost Basis 2,400,000 6,240,000
Gross Unrealized Gains 979 571
Gross Unrealized Losses   (5,575)
Fair value $ 2,400,979 $ 6,234,996