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Cash, Cash Equivalent, and Investments (Details) - USD ($)	12 Months Ended
	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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