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Marketable Securities | 12 Months Ended
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Dec. 31, 2017
Marketable Securities [Abstract] |
Marketable Securities | Note 4 – Marketable Securities ﻿ The Company’s current investment policy is to invest in cash, certificates of deposit, U.S. treasury securities, U.S. government agency obligations and money market funds invested in U.S. government securities. Marketable securities as of December 31, 201 7 of $42,917 consisted of U.S. treasury securities held to maturity and certificates of deposit with original maturities of greater than 90 days and up to one year. Due to the short-term nature of these securities and their low interest rates, there is no material difference between their fair market values and amortized costs. The Company owned no marketable securities as of December 31, 2016.

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