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Note 21 - Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Weighted average fair value of options granted |  | $ | 4.52 |  |  | $ | 4.39 |  |  | $ | 3.82 |
Weighted average risk-free interest rates |  |  | 1.04 | % |  |  | 2.02 | % |  |  | 2.40 | %
Weighted average expected option lives (in years) |  |  | 6.25 |  |  |  | 6.25 |  |  |  | 6.25 |
Weighted average expected volatility |  |  | 37.53 | % |  |  | 36.82 | % |  |  | 37.98 | %
Weighted average expected dividend yield |  |  | 3.94 | % |  |  | 3.98 | % |  |  | 4.21 | %
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Shares |  |  | Weighted- Average Exercise Price Per Share |  |  | Aggregate Intrinsic Value (in millions) |
Options outstanding, January 1, 2010 |  |  | 17,560,921 |  |  | $ | 29.69 |  |  | $ | 3.4 |
Exercised |  |  | (616,245 | ) |  | $ | 13.73 |  |  |  |  |
Granted |  |  | 1,776,175 |  |  | $ | 15.63 |  |  |  |  |
Forfeited |  |  | (1,605,062 | ) |  | $ | 33.68 |  |  |  |  |
Options outstanding, December 31, 2010 |  |  | 17,115,789 |  |  | $ | 28.32 |  |  | $ | 18.0 |
Exercised |  |  | (444,368 | ) |  | $ | 14.71 |  |  |  |  |
Granted |  |  | 1,888,017 |  |  | $ | 18.77 |  |  |  |  |
Expired |  |  | (655,748 | ) |  | $ | 16.40 |  |  |  |  |
Forfeited |  |  | (793,098 | ) |  | $ | 23.74 |  |  |  |  |
Options outstanding, December 31, 2011 |  |  | 17,110,592 |  |  | $ | 28.14 |  |  | $ | 8.0 |
Exercised |  |  | (1,495,432 | ) |  | $ | 19.84 |  |  |  |  |
Granted |  |  | 1,522,450 |  |  | $ | 18.78 |  |  |  |  |
Forfeited |  |  | (579,613 | ) |  | $ | 28.73 |  |  |  |  |
Options outstanding, December 31, 2012 |  |  | 16,557,997 |  |  | $ | 28.42 |  |  | $ | 14.9 |
Options exercisable (fully vested)- |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2010 |  |  | 11,712,900 |  |  | $ | 29.74 |  |  | $ | 5.8 |
December 31, 2011 |  |  | 12,459,598 |  |  | $ | 30.77 |  |  | $ | 3.9 |
December 31, 2012 |  |  | 12,830,255 |  |  | $ | 31.57 |  |  | $ | 7.7 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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