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Note 3 - Investments | 9 Months Ended
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Sep. 30, 2018
Notes to Financial Statements |
Investments and Restricted Cash Disclosure [Text Block] | Note 3. Investments Our current investments, which are classified as "available for sale" and consist of bonds having maturities of greater than 90 days were $33.8 million at December 31, 2017. We held no such investments as of September 30, 2018. During the first nine months of 2018 and 2017, we had purchases of such investments of $31.2 million and $35.3 million, respectively, and maturities of $64.9 million and $31.2 million, respectively. Our current investments at December 31, 2017 consisted of the following (in thousands):
|  | December 31, 2017 |
|  | Amortized cost |  |  | Unrealized+ loss |  |  | Fair value |
Corporate bonds |  | $ | 33,778 |  |  | $ | (20 | ) |  | $ | 33,758 |
At September 30, 2018 and December 31, 2017, the fair value of our non-current investments was $7.2 million and $7.6 million, respectively. Our non-current investments consist of marketable equity securities which are carried at fair value, and are primarily classified as “available-for-sale.” The cost basis of our non-current investments was approximately $7.9 million and $5.7 million at September 30, 2018 and December 31, 2017, respectively. In the first nine months of 2018 and 2017, we acquired marketable equity securities having a cost basis of $0.8 million and $1.6 million, respectively. During the first nine months of 2018, we recognized $2.5 million in net unrealized losses in current earnings. During the first nine months of 2017, we recognized $1.5 million in net unrealized gains in other comprehensive income and $0.1 million in net unrealized losses in current earnings.

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