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Carrying Amounts and Fair Values of Company's Financial Instruments (Detail) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Assets, Fair Value Disclosure | $ 42,374,500 | $ 48,944,580
Fair Value, Inputs, Level 1 [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 42,374,500 | 43,605,694
Fair Value, Inputs, Level 2 [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Assets |  |
Assets, Fair Value Disclosure |  | 5,338,886
Money Market Funds [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 41,231,405 | 42,553,887
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 41,231,405 | 42,553,887
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
Certificates of Deposit [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 1,057,090 | 1,051,807
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 1,057,090 | 1,051,807
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Equity Securities [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 86,005 | 5,338,886
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 86,005 | 0
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | $ 0 | $ 5,338,886

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- 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=66048111&loc=d3e19207-110258 + Details
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