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Fair Value Measurements (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value Measurements |  |
Fair value assets, amount transferred between measurement levels | $ 0 | $ 0
Fair value liabilities, amount transferred between measurement levels | 0 | 0
Recurring |  |
Fair Value Measurements |  |
Total | 5,382,861 | 6,349,915
Recurring | U.S. corporations |  |
Fair Value Measurements |  |
Total | 4,453,130 | 5,429,336
Recurring | International corporations |  |
Fair Value Measurements |  |
Total | 929,731 | 920,579
Recurring | Significant Other Observable Inputs (Level 2) |  |
Fair Value Measurements |  |
Total | 5,382,861 | 6,349,915
Recurring | Significant Other Observable Inputs (Level 2) | U.S. corporations |  |
Fair Value Measurements |  |
Total | 4,453,130 | 5,429,336
Recurring | Significant Other Observable Inputs (Level 2) | International corporations |  |
Fair Value Measurements |  |
Total | $ 929,731 | $ 920,579

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- Definition Represents the amount of transfer of liabilities between the levels of fair value hierarchy. + References No definition available. + Details
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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://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 + Details
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