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Note 2 - Investments | 12 Months Ended
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Dec. 31, 2016
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 $29.1 million at December 31, 2016. During 2016, we had purchases of such investments of $48.0 million and maturities of $18.6 million. We held no such investments as of December 31, 2015. Our current investments at December 31, 2016 consist of the following:
|  | Amortized cost |  |  | Unrealized loss |  |  | Fair market value |
Corporate bonds |  | $ | 22,100 |  |  | $ | (46 | ) |  | $ | 22,054 |
Municipal bonds |  |  | 3,727 |  |  |  | (1 | ) |  |  | 3,726 |
Agency bonds |  |  | 3,339 |  |  |  | (2 | ) |  |  | 3,337 |
Total |  | $ | 29,166 |  |  | $ | (49 | ) |  | $ | 29,117 |
At December 31, 2016 and 2015, the fair value of our non-current investments was $5.0 million and $1.5 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 $4.1 million and $4.0 million at December 31, 2016 and 2015, respectively. In each of 2016 and 2015, we acquired marketable equity securities having a cost basis of $0.9 million. In 2016 and 2015, we recognized impairment charges against current earnings of $1.0 million and $2.5 million, respectively, as we determined the impairments to be other-than-temporary.

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