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Note 2 - Investments | 3 Months Ended
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Mar. 31, 2018
Notes to Financial Statements |
Investments and Restricted Cash Disclosure [Text Block] | Note 2. Investments Investments Our current investments, which are classified as "available for sale" and consist of bonds having maturities of greater than 90 days and less than 365 days, had a fair value of $34.4 million and $33.8 million, respectively, at March 31, 2018 and December 31, 2017. During the first quarter of 2018 and 2017, we had purchases of such investments of $31.2 million and $11.1 million, respectively, and maturities of $30.5 million and $3.6 million, respectively. Our current investments at March 31, 2018 and December 31, 2017 consisted of the following:
|  | March 31, 2018 |  |  | December 31, 2017 |
|  | Amortized cost |  |  | Unrealized loss |  |  | Fair market value |  |  | Amortized cost |  |  | Unrealized loss |  |  | Fair market value |
Corporate bonds |  | $ | 34,394 |  |  | $ | (36 | ) |  | $ | 34,358 |  |  | $ | 33,778 |  |  | $ | (20 | ) |  | $ | 33,758 |
At March 31, 2018 and December 31, 2017, the fair value of our non-current investments was $7.7 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 $5.6 million and $5.7 million at March 31, 2018 and December 31, 2017, respectively. We had net unrealized gains of $2.1 million and $1.9 million on equity investments held as of March 31, 2018 and December 31, 2017, respectively. During the quarter ended March 31, 2018, we recognized $0.3 million in net unrealized gains in current earnings. During the quarter ended March 31, 2017, we recognized $0.3 million in net unrealized losses on equity investments in other comprehensive income and $0.3 million in net unrealized gains in current earnings.

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