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

Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain, Current

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Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain, Noncurrent

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Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss, Current

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Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss, Noncurrent

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Debt Securities, Held-to-maturity, Fair Value, Current

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Debt Securities, Held-to-maturity, Premium Paid on Purchase

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Investments and Cash, Amortized Cost

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of investment in debt security measured at amortized cost (held-to-maturity), classified as current.

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Amount of investment in debt security measured at amortized cost (held-to-maturity), classified as noncurrent.

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Sum of investments and unrestricted cash as of the balance sheet date.

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