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)

v2.4.1.9
Marketable Securities (Schedule Of Cost And Fair Value Of Cash, Cash Equivalents, And Marketable Securities) (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Cost Basis $ 18,654,745us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 22,905,698us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Gains 4,152us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 122us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Gross Unrealized Losses (3,076)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax (33,769)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Fair value 18,655,821us-gaap_AvailableForSaleSecurities 22,872,051us-gaap_AvailableForSaleSecurities
Commercial Paper [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost Basis 999,084us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember
1,998,001us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember
Gross Unrealized Gains 196us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InvestmentTypeAxis
= us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember
62us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InvestmentTypeAxis
= us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember
Gross Unrealized Losses   (153)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember
Fair value 999,280us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember
1,997,910us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost Basis 2,535,661us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
2,042,697us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
Gross Unrealized Losses (1,561)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
(6,827)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
Fair value 2,534,100us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
2,035,870us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost Basis 15,120,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CertificatesOfDepositMember
18,865,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CertificatesOfDepositMember
Gross Unrealized Gains 3,956us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CertificatesOfDepositMember
60us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CertificatesOfDepositMember
Gross Unrealized Losses (1,515)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CertificatesOfDepositMember
(26,789)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CertificatesOfDepositMember
Fair value $ 15,122,441us-gaap_AvailableForSaleSecurities
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CertificatesOfDepositMember
$ 18,838,271us-gaap_AvailableForSaleSecurities
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CertificatesOfDepositMember