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Marketable Securities	3 Months Ended
	Mar. 31, 2019
Marketable Securities [Abstract]
Marketable Securities	Note 8 – 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 of $1,998 and $18,019 as of March 31, 2019 and December 31, 2018, respectively, 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.

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The entire disclosure for investments in certain debt and equity securities.

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