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Cash, Cash Equivalent, and Investments (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and Cash Equivalents | $ 2,386,314 | $ 5,786,348
Short term investments, adjusted cost | 38,816,441 | 41,898,754
Long term investments, adjusted cost | 0 | 922,648
Cash and Investment, fair value | 41,117,434 | 48,509,319
Investment, gross unrealized holding gain | 0 | 0
Investment, gross unrealized holding losses | 85,321 | 98,431
Cash and Investment, adjusted cost | 41,202,755 | 48,607,750
Cash |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and Cash Equivalents | 1,048,272 | 838,110
Money Market Funds | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and Cash Equivalents | 1,338,042 | 4,948,238
Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held-to-maturity, premium paid on purchase | 378,681 | 915,084
Corporate bonds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short term investments, fair value | 38,731,120 | 41,811,273
Short term investments, gross unrealized holding gain | 0 | 0
Short term investments, gross unrealized holding loss | (85,321) | (87,481)
Short term investments, adjusted cost | 38,816,441 | 41,898,754
Long term Investments, fair value | 0 | 911,698
Long term Investments, gross unrealized holding gain | 0 | 0
Long term Investments, gross unrealized holding loss | 0 | (10,950)
Long term investments, adjusted cost | $ 0 | $ 922,648

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