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Fair Value of Financial Instruments (Valuation of Securities Using Fair Value Hierarchy) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
United States
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	$ (17,096,060)us-gaap_InvestmentsFairValueDisclosure / invest_InvestmentGeographicRegionAxis = country_US	$ 1,642,450us-gaap_InvestmentsFairValueDisclosure / invest_InvestmentGeographicRegionAxis = country_US
Short-Term Investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	30,998,094us-gaap_InvestmentsFairValueDisclosure / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermInvestmentsMember	59,154,742us-gaap_InvestmentsFairValueDisclosure / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermInvestmentsMember
Fair Value, Inputs, Level 1 | United States
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	(17,096,060)us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / invest_InvestmentGeographicRegionAxis = country_US	1,642,450us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / invest_InvestmentGeographicRegionAxis = country_US
Fair Value, Inputs, Level 1 | Short-Term Investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	30,998,094us-gaap_InvestmentsFairValueDisclosure / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	59,154,742us-gaap_InvestmentsFairValueDisclosure / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 | United States
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / invest_InvestmentGeographicRegionAxis = country_US	0us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / invest_InvestmentGeographicRegionAxis = country_US
Fair Value, Inputs, Level 2 | Short-Term Investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0us-gaap_InvestmentsFairValueDisclosure / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0us-gaap_InvestmentsFairValueDisclosure / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 | United States
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / invest_InvestmentGeographicRegionAxis = country_US	0us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / invest_InvestmentGeographicRegionAxis = country_US
Fair Value, Inputs, Level 3 | Short-Term Investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	$ 0us-gaap_InvestmentsFairValueDisclosure / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	$ 0us-gaap_InvestmentsFairValueDisclosure / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ShortTermInvestmentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

X

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph a, f, g

-Article 7



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

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