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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 assets between the levels of fair value hierarchy.

+ References

No definition available.

+ Details

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- Definition

Represents the amount of transfer of liabilities between the levels of fair value hierarchy.

+ References

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+ Details

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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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- 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.

+ References

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