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Short Term Investments Available for Sale - Schedule of Unrealized Losses and Fair Value of Investment Securities (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Fair Value Disclosures [Abstract] |  |
Less than 12 months, unrealized gains, fair value | $ 7,515,676 | $ 748,148
Less than 12 months, unrealized losses, fair value | 6,742,322 | 11,975,872
Investment securities - available for sale, at fair value | 14,257,998 | 12,724,020
Less than 12 months, unrealized holding gains | 38,068 | 570
Less than 12 months, unrealized holding losses | (8,196) | (10,734)
Unrealized holding gains (losses) | $ 29,872 | $ (10,164)

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