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Note 2 - Investments | 6 Months Ended
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Jun. 30, 2017
Notes to Financial Statements |
Investments and Restricted Cash Disclosure [Text Block] |
Note 2. | Investments
Our current investments, which are classified as "available for sale" and consist of bonds having maturities of greater than 90 days, had a fair value and cost basis of $37.8 million and $29.1 million, respectively, at June 30, 2017 and December 31, 2016. During the first six months of 2017, we had purchases of such investments of $23.3 million and maturities of $14.4 million. Our current investments at June 30, 2017 and December 31, 2016 consisted of the following (in thousands):
|  | June 30, 2017 |  |  | December 31, 2016 |
|  | Amortized cost |  |  | Unrealized loss |  |  | Fair value |  |  | Amortized cost |  |  | Unrealized loss |  |  | Fair value |
Corporate bonds |  | $ | 34,533 |  |  | $ | (33 | ) |  | $ | 34,500 |  |  | $ | 22,100 |  |  | $ | (46 | ) |  | $ | 22,054 |
Municipal bonds |  |  | 1,715 |  |  |  | — |  |  |  | 1,715 |  |  |  | 3,727 |  |  |  | (1 | ) |  |  | 3,726 |
Agency bonds |  |  | 1,601 |  |  |  | — |  |  |  | 1,601 |  |  |  | 3,339 |  |  |  | (2 | ) |  |  | 3,337 |
Total |  | $ | 37,849 |  |  | $ | (33 | ) |  | $ | 37,816 |  |  | $ | 29,166 |  |  | $ | (49 | ) |  | $ | 29,117 |
At June 30, 2017 and December 31, 2016, the fair value of our non-current investments was $4.7 million and $5.0 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 $4.0 million at June 30, 2017 and December 31, 2016.

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