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Cash, Cash Equivalents and Short-Term Investments (Details 1) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Schedule of fair value of held to maturity securities
Amortized cost		$ 5,450,000
Accrued interest		24,013
Gross unrealized gains		2,073
Gross unrealized losses		(59)
Estimated fair value		$ 5,476,027

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