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SHORT-TERM INVESTMENTS | 12 Months Ended
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Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | NOTE 3 — SHORT-TERM INVESTMENTS The following table summarizes the available-for-sale investments held as of December 31, 2018. There were no available-for-sale investments in prior periods.
Description |  | Fair value |
U.S. government and agency securities and treasuries |  | $ | 66,218,000 |
The amortized cost of the available-for-sale investments is adjusted for amortization of premiums and accretion of discounts to maturity. There were no material realized gains or losses recognized on the sale or maturity of available-for-sale investments during the year ended December 31, 2018.

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