Fair Value Measurements (Details) - USD ($) |
Jun. 30, 2018 |
Dec. 31, 2017 |
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| Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Investments, Fair Value Disclosure | $ 236,743,331 | $ 235,195,034 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- 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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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