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Note 7 - Available-for-Sale Investments (Details Textual) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015
Asset-backed Securities [Member] |  |
Available-for-Sale Securities, Maturity Term | 10 years |
Proceeds from Sale of Short-term Investments | $ 121 | $ 825

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- Definition The maturities term of available-for-sale securities. + References No definition available. + Details
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- Definition The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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- Details
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