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Carrying Amounts and Fair Values of Company's Financial Instruments (Detail) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Assets
Assets, Fair Value Disclosure	$ 69,147,538	$ 86,627,847
Fair Value, Inputs, Level 1 [Member]
Assets
Assets, Fair Value Disclosure	69,147,538	86,627,847
Fair Value, Inputs, Level 2 [Member]
Assets
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member]
Assets
Assets, Fair Value Disclosure	0	0
Money Market Funds [Member]
Assets
Assets, Fair Value Disclosure	68,004,532	85,500,745
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Assets
Assets, Fair Value Disclosure	68,004,532	85,500,745
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Assets
Assets, Fair Value Disclosure	0	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Assets
Assets, Fair Value Disclosure	0	0
Marketable securities – certificates of deposit
Assets
Assets, Fair Value Disclosure	1,074,280	1,066,103
Marketable securities – certificates of deposit | Fair Value, Inputs, Level 1 [Member]
Assets
Assets, Fair Value Disclosure	1,074,280	1,066,103
Marketable securities – certificates of deposit | Fair Value, Inputs, Level 2 [Member]
Assets
Assets, Fair Value Disclosure	0	0
Marketable securities – certificates of deposit | Fair Value, Inputs, Level 3 [Member]
Assets
Assets, Fair Value Disclosure	0	0
Marketable securities – equity securities
Assets
Assets, Fair Value Disclosure	68,726	60,999
Marketable securities – equity securities | Fair Value, Inputs, Level 1 [Member]
Assets
Assets, Fair Value Disclosure	68,726	60,999
Marketable securities – equity securities | Fair Value, Inputs, Level 2 [Member]
Assets
Assets, Fair Value Disclosure	0	0
Marketable securities – equity securities | Fair Value, Inputs, Level 3 [Member]
Assets
Assets, Fair Value Disclosure	$ 0	$ 0

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- References

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