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Note 6 - Available-for-Sale Investments (Tables) | 6 Months Ended
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Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
| Amortized cost |  | Fair value
| June 30, 2015 |  | December 31, 2014 |  | June 30, 2015 |  | December 31, 2014
Bonds, notes and other securities: |  |  |  |  |  |  |  |  |  |  |
U.S. government and agencies | $ | 505 |  | $ | 759 |  | $ | 505 |  | $ | 759
Total short-term investments | $ | 505 |  | $ | 759 |  | $ | 505 |  | $ | 759
Asset-backed securities | $ | 40 |  | $ | 42 |  | $ | 35 |  | $ | 38
Total long-term investments | $ | 40 |  | $ | 42 |  | $ | 35 |  | $ | 38
Investments Classified by Contractual Maturity Date [Table Text Block] |
Less than one year | $505
Due in 1-5 years |
Due in 5-10 years |
Due after 10 years (1) | 35
Total | $540
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  |  | June 30, 2015
|  |  | 12 months or greater |  | Total
| Number of securities in a loss position |  | Fair value |  | Unrealized losses (1) |  | Fair value |  | Unrealized losses
Asset-backed securities | 21 |  | $ | 35 |  | $ | (4) |  | $ | 35 |  | $ | (4)
Total long-term investments | 21 |  | $ | 35 |  | $ | (4) |  | $ | 35 |  | $ | (4)
|  |  | December 31, 2014
|  |  | 12 months or greater |  | Total
| Number of securities in a loss position |  | Fair value |  | Unrealized losses (1) |  | Fair value |  | Unrealized losses
Asset-backed securities | 21 |  | $ | 37 |  | $ | (4) |  | $ | 37 |  | $ | (4)
Total long-term investments | 21 |  | $ | 37 |  | $ | (4) |  | $ | 37 |  | $ | (4)

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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