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Note 7 - Available-for-Sale Investments (Tables) | 6 Months Ended
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Jun. 30, 2016
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
| Amortized cost |  | Fair value
| June 30, 2016 |  | December 31, 2015 |  | June 30, 2016 |  | December 31, 2015
Bonds, notes and other securities: |  |  |  |  |  |  |  |  |  |  |
U.S. government and agencies |  |  |  | $ | 100 |  |  |  |  | $ | 100
Total short-term investments |  |  |  | $ | 100 |  |  |  |  | $ | 100
Asset-backed securities (1) | $ | 34 |  | $ | 37 |  | $ | 30 |  | $ | 33
Total long-term investments | $ | 34 |  | $ | 37 |  | $ | 30 |  | $ | 33

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