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Fair Value Measurement - Marketable Securities (Details Narrative) - USD ($) | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract] |  |
Maturities of securities | 1 year |
Net unrealized gain on marketable securities | $ 16,843 | $ 156
Income tax expense |  |
Proceeds from the sale of marketable securities | 302,095 | 1,095,218
Net gain on securities |  | $ 1,051

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