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Note 2 - Investments and Restricted Cash | 3 Months Ended
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Mar. 31, 2017
Notes to Financial Statements |
Investments and Restricted Cash Disclosure [Text Block] | Note 2. Investments and Restricted Cash 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 $36.5 million and $29.1 million, respectively, at March 31, 2017 and December 31, 2016. During the first quarter of 2017, we had purchases of such investments of $11.1 million and maturities of $3.6 million. We held no such investments during the first quarter of 2016. Our current investments at March 31, 2017 and December 31, 2016 consisted of the following:
|  | March 31, 2017 |  |  | December 31, 2016 |
|  | Amortized cost |  |  | Unrealized loss |  |  | Fair market value |  |  | Amortized cost |  |  | Unrealized loss |  |  | Fair market value |
Corporate bonds |  | $ | 30,077 |  |  | $ | (38 | ) |  | $ | 30,039 |  |  | $ | 22,100 |  |  | $ | (46 | ) |  | $ | 22,054 |
Municipal bonds |  |  | 3,138 |  |  |  | — |  |  |  | 3,138 |  |  |  | 3,727 |  |  |  | (1 | ) |  |  | 3,726 |
Agency bonds |  |  | 3,331 |  |  |  | (3 | ) |  |  | 3,328 |  |  |  | 3,339 |  |  |  | (2 | ) |  |  | 3,337 |
Total |  | $ | 36,546 |  |  | $ | (41 | ) |  | $ | 36,505 |  |  | $ | 29,166 |  |  | $ | (49 | ) |  | $ | 29,117 |
At March 31, 2017 and December 31, 2016, the fair value of our non-current investments was $5.1 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 $3.9 million and $4.1 million, respectively, at March 31, 2017 and December 31, 2016. In the first quarter of 2016, we recognized total impairment charges against earnings of $1.0 million, as we determined the impairments to be other-than-temporary.

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