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Investments (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Amortized Cost, as Adjusted	$ 22,869,924	$ 28,762,231
Short Term Investments [Member]
Amortized Cost, as Adjusted	18,949,924	21,556,857
Gross Unrealized Holding Gains	1,237	0
Gross Unrealized Holding Losses	43,298	38,880
Estimated Fair Value	18,907,863	21,517,977
Short Term Investments [Member] | Certificates of Deposit
Amortized Cost, as Adjusted	9,902,512	14,001,237
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	5,483	20,146
Estimated Fair Value	9,897,029	13,981,091
Short Term Investments [Member] | Governmental Agency Securities
Amortized Cost, as Adjusted	7,551,052	5,945,314
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	37,815	18,101
Estimated Fair Value	7,513,237	5,927,213
Short Term Investments [Member] | U.S. Treasury Notes
Amortized Cost, as Adjusted	1,496,360	1,610,306
Gross Unrealized Holding Gains	1,237	0
Gross Unrealized Holding Losses	0	633
Estimated Fair Value	1,497,597	1,609,673
Long Term Investments [Member]
Amortized Cost, as Adjusted	3,920,000	7,205,374
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	36,722	36,388
Estimated Fair Value	3,883,278	7,168,986
Long Term Investments [Member] | Certificates of Deposit
Amortized Cost, as Adjusted	3,920,000	4,165,000
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	36,722	21,481
Estimated Fair Value	$ 3,883,278	4,143,519
Long Term Investments [Member] | Governmental Agency Securities
Amortized Cost, as Adjusted		3,040,374
Gross Unrealized Holding Gains		0
Gross Unrealized Holding Losses		14,907
Estimated Fair Value		$ 3,025,467

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Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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