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Cash, Cash Equivalent, and Investments (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents | $ 4,662,327 |  | $ 4,662,327 |  | $ 2,386,314
Short term investments, adjusted cost | 30,793,472 |  | 30,793,472 |  | 38,816,441
Long term investments, adjusted cost | 1,514,153 |  | 1,514,153 |  | 0
Cash and Investment, fair value | 36,984,818 |  | 36,984,818 |  | 41,117,434
Investment, gross unrealized holding gain | 30,574 |  | 30,574 |  | 0
Investment, gross unrealized holding losses | (15,708) |  | (15,708) |  | (85,321)
Cash and Investment, adjusted cost | 36,969,952 |  | 36,969,952 |  | 41,202,755
Cash |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents | 552,569 |  | 552,569 |  | 1,048,272
Money Market Funds | Level 1 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and Cash Equivalents | 4,109,758 |  | 4,109,758 |  | 1,338,042
Corporate bonds |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Held-to-maturity, premium paid on purchase | 54,385 | $ 0 | 158,548 | $ 205,038 | 378,681
Corporate bonds | Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Short term investments, fair value | 30,794,626 |  | 30,794,626 |  | 38,731,120
Short term investments, gross unrealized holding gain | 16,862 |  | 16,862 |  | 0
Short term investments, gross unrealized holding loss | (15,708) |  | (15,708) |  | (85,321)
Short term investments, adjusted cost | 30,793,472 |  | 30,793,472 |  | $ 38,816,441
Long term Investments, fair value | 1,527,865 |  | 1,527,865 |  |
Long term Investments, gross unrealized holding gain | 13,712 |  | 13,712 |  |
Long term Investments, gross unrealized holding loss | 0 |  | 0 |  |
Long term investments, adjusted cost | $ 1,514,153 |  | $ 1,514,153 |  |

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