Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Marketable Securities (Schedule Of Cost And Fair Value Of Marketable Securities) (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Cost Basis $ 8,743,229 $ 13,258,127
Gross Unrealized Gains 197 571
Gross Unrealized Losses (6,319) (18,612)
Fair value 8,737,107 13,240,086
Commercial Paper [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost Basis 3,987,424 2,981,307
Gross Unrealized Losses (1,684) (3,737)
Fair value 3,985,740 2,977,570
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost Basis 4,035,805 4,036,820
Gross Unrealized Losses (4,635) (9,300)
Fair value 4,031,170 4,027,520
Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost Basis 720,000 6,240,000
Gross Unrealized Gains 197 571
Gross Unrealized Losses   (5,575)
Fair value $ 720,197 $ 6,234,996