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Note 12 - Debt (Details) - Long-term Debt (Parentheticals) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Debentures, 8.875%, Due 2016 [Member] |  |
Note 12 - Debt (Details) - Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on debt | 8.875% | 8.875%
Debt maturity date | 2016 | 2016
Debentures, 1.45%, Due 2017 [Member] |  |
Note 12 - Debt (Details) - Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on debt | 1.45% | 1.45%
Debt maturity date | 2017 | 2017
Debentures 1.5%, Due 2018 [Member] |  |
Note 12 - Debt (Details) - Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on debt | 1.50% |
Debt maturity date | 2018 |
Debentures 6.625% Due 2019 [Member] |  |
Note 12 - Debt (Details) - Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on debt | 6.625% | 6.625%
Debt maturity date | 2019 | 2019
Debentures 4.25% Due 2020 [Member] |  |
Note 12 - Debt (Details) - Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on debt | 4.25% | 4.25%
Debt maturity date | 2020 | 2020
Debentures, 8.875%, Due 2021 [Member] |  |
Note 12 - Debt (Details) - Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on debt | 8.875% | 8.875%
Debt maturity date | 2021 | 2021
Debentures 2.9%, Due 2022 [Member] |  |
Note 12 - Debt (Details) - Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on debt | 2.90% |
Debt maturity date | 2022 |
Debentures, 3.70%, due 2023 [Member] |  |
Note 12 - Debt (Details) - Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on debt | 3.70% | 3.70%
Debt maturity date | 2023 | 2023
Medium Term Notes Average Rate 7.66% Due Through 2023 [Member] |  |
Note 12 - Debt (Details) - Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on debt | 7.66% | 7.66%
Debt maturity date | 2023 | 2023
Debentures 7.00% Due 2024 [Member] |  |
Note 12 - Debt (Details) - Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on debt | 7.00% | 7.00%
Debt maturity date | 2024 | 2024
Debentures 6.85% Due 2029 [Member] |  |
Note 12 - Debt (Details) - Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on debt | 6.85% | 6.85%
Debt maturity date | 2029 | 2029
Debentures Callable 7.25% Due 2036 [Member] |  |
Note 12 - Debt (Details) - Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on debt | 7.25% | 7.25%
Debt maturity date | 2036 | 2036
Debentures, 4.70%, Due 2037 [Member] |  |
Note 12 - Debt (Details) - Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on debt | 4.70% | 4.70%
Debt maturity date | 2037 | 2037
Debentures 5.75% Due 2040 [Member] |  |
Note 12 - Debt (Details) - Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on debt | 5.75% | 5.75%
Debt maturity date | 2040 | 2040
Debentures, 4.75%, Due 2042 [Member] |  |
Note 12 - Debt (Details) - Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on debt | 4.75% | 4.75%
Debt maturity date | 2042 | 2042
Other Average Rate 5.02%, Due Through 2042 [Member] |  |
Note 12 - Debt (Details) - Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on debt | 5.02% | 5.02%
Debt maturity date | 2042 | 2042

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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