Marketable Securities (Schedule Of Cost And Fair Value Of Cash, Cash Equivalents, And Marketable Securities) (Details) (USD $)
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Mar. 31, 2015
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Dec. 31, 2014
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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 |
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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 |
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- Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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