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Fair Value Measurement - Marketable Securities - Schedule of Marketable Securities (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 8,680,456 | $ 5,010,165
Accrued Income | 15,397 | 1,442
Unrealized Gains |  |
Unrealized Losses | (16,843) |
Fair Value | 8,679,010 | 5,011,607
Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 8,680,456 | 5,010,165
Accrued Income | 15,397 | 1,442
Unrealized Gains |  |
Unrealized Losses | (16,843) |
Fair Value | 8,679,010 | 5,011,607
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 26 | 5,165
Accrued Income | 5 | 161
Unrealized Gains |  |
Unrealized Losses |  |
Fair Value | 31 | 5,326
Fair Value, Inputs, Level 2 [Member] | Municipal Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 8,680,430 | 5,005,000
Accrued Income | 15,392 | 1,281
Unrealized Gains |  |
Unrealized Losses | (16,843) |
Fair Value | $ 8,678,979 | $ 5,006,281

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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