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Fair Value Measurement - Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Schedule of Marketable Securities | This includes basing value on yields currently available on comparable securities of issuers with similar credit ratings.
|  | As of March 31, 2018 |
|  |  |  |  | Accrued |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Income |  |  | Gains |  |  | Losses |  |  | Value |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 26 |  |  | $ | 5 |  |  | $ | - |  |  | $ | - |  |  | $ | 31 |
Municipal securities |  |  | 8,680,430 |  |  |  | 15,392 |  |  |  | - |  |  |  | (16,843 | ) |  |  | 8,678,979 |
Total Level 2: |  |  | 8,680,456 |  |  |  | 15,397 |  |  |  | - |  |  |  | (16,843 | ) |  |  | 8,679,010 |
Total: |  | $ | 8,680,456 |  |  | $ | 15,397 |  |  | $ | - |  |  | $ | (16,843 | ) |  | $ | 8,679,010 |
|  | As of December 31, 2017 |
|  |  |  |  | Accrued |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Income |  |  | Gains |  |  | Losses |  |  | Value |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 5,165 |  |  | $ | 161 |  |  | $ | - |  |  | $ | - |  |  | $ | 5,326 |
Municipal securities |  |  | 5,005,000 |  |  |  | 1,281 |  |  |  | - |  |  |  | - |  |  |  | 5,006,281 |
Total Level 2: |  |  | 5,010,165 |  |  |  | 1,442 |  |  |  | - |  |  |  | - |  |  |  | 5,011,607 |
Total: |  | $ | 5,010,165 |  |  | $ | 1,442 |  |  | $ | - |  |  | $ | - |  |  | $ | 5,011,607 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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