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Marketable Securities and Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	$ 168,823,399	$ 179,825,048
Liabilities, fair value	1,707,387	1,301,138
Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	63,657,167	74,461,801
Liabilities, fair value	0	0
Using Significant Other Unobservable Inputs (Level 2) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	105,163,382	105,357,277
Liabilities, fair value	0	0
Using Significant Unobservable Inputs (Level 3) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	2,850	5,970
Liabilities, fair value	1,707,387	1,301,138
Money market funds [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	36,207,995	54,474,609
Money market funds [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	36,207,995	54,474,609
Money market funds [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
Money market funds [Member] | Using Significant Unobservable Inputs (Level 3) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
Mutual funds [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	78,569,290	78,385,992
Mutual funds [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
Mutual funds [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	78,569,290	78,385,992
Mutual funds [Member] | Using Significant Unobservable Inputs (Level 3) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
US corporate debt securities [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	26,493,360	26,869,403
US corporate debt securities [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
US corporate debt securities [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	26,493,360	26,869,403
US corporate debt securities [Member] | Using Significant Unobservable Inputs (Level 3) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
Municipal Bonds [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	100,732	101,882
Municipal Bonds [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
Municipal Bonds [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	100,732	101,882
Municipal Bonds [Member] | Using Significant Unobservable Inputs (Level 3) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
Investment in affiliated entity [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	27,449,172	19,987,192
Investment in affiliated entity [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	27,449,172	19,987,192
Investment in affiliated entity [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
Investment in affiliated entity [Member] | Using Significant Unobservable Inputs (Level 3) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
Common stock warrants [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	2,850	5,970
Liabilities, fair value	1,707,387	1,301,138
Common stock warrants [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
Liabilities, fair value	0	0
Common stock warrants [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
Liabilities, fair value	0	0
Common stock warrants [Member] | Using Significant Unobservable Inputs (Level 3) [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	2,850	5,970
Liabilities, fair value	$ 1,707,387	$ 1,301,138

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

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+ References

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-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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