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Note 6 - Income Taxes (Details) - Deferred Tax Assets for Loss and Tax Credit Carryforwards - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Note 6 - Income Taxes (Details) - Deferred Tax Assets for Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating losses | $ 406 |
Tax credits | 745 |
Totals as of December 31, 2015 | 1,151 | $ 1,235
2016-2020 [Member] |  |
Note 6 - Income Taxes (Details) - Deferred Tax Assets for Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating losses | 127 |
Tax credits | 414 |
Totals as of December 31, 2015 | 541 |
2021-2025 [Member] |  |
Note 6 - Income Taxes (Details) - Deferred Tax Assets for Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating losses | 63 |
Tax credits | 58 |
Totals as of December 31, 2015 | 121 |
2026-2035 [Member] |  |
Note 6 - Income Taxes (Details) - Deferred Tax Assets for Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating losses | 3 |
Tax credits | 237 |
Totals as of December 31, 2015 | 240 |
Indefinite [Member] |  |
Note 6 - Income Taxes (Details) - Deferred Tax Assets for Loss and Tax Credit Carryforwards [Line Items] |  |
Net operating losses | 213 |
Tax credits | 36 |
Totals as of December 31, 2015 | $ 249 |

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