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Note 20 - Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Shares |  |  | Weighted-Average Exercise Price Per Share |  |  | Aggregate Intrinsic V alue (in millions) |
Options outstanding, January 1, 2016 |  |  | 9,012,441 |  |  | $ | 31.09 |  |  | $ | 27.4 |
Exercised |  |  | (1,167,819 | ) |  | $ | 18.03 |  |  | $ | 12.4 |
Forfeited |  |  | (1,830,893 | ) |  | $ | 39.69 |  |  |  |  |
Options outstanding, December 31, 2016 |  |  | 6,013,729 |  |  | $ | 32.09 |  |  | $ | 12.1 |
Exercised |  |  | (83,863 | ) |  | $ | 18.20 |  |  | $ | 3.4 |
Forfeited |  |  | (2,464,920 | ) |  | $ | 35.91 |  |  |  |  |
Options outstanding, December 31, 2017 |  |  | 3,464,946 |  |  | $ | 27.81 |  |  | $ | - |
Exercised |  |  | (42,259 | ) |  | $ | 14.00 |  |  | $ | 0.1 |
Forfeited |  |  | (1,781,321 | ) |  | $ | 36.53 |  |  |  |  |
Options outstanding, December 31, 2018 |  |  | 1,641,366 |  |  | $ | 18.78 |  |  | $ | 0.4 |
Options exercisable (fully vested) - |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2016 |  |  | 5,144,416 |  |  | $ | 32.56 |  |  | $ | 11.3 |
December 31, 2017 |  |  | 3,464,946 |  |  | $ | 27.81 |  |  | $ | 4.0 |
December 31, 2018 |  |  | 1,641,366 |  |  | $ | 18.78 |  |  | $ | 0.4 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  | 201 8 |  |  | 201 7 |  |  | 201 6 |
Restricted stock outstanding as of January 1, |  |  | 1,777,429 |  |  |  | 1,930,732 |  |  |  | 1,712,534 |
Granted (1) |  |  | 1,100,590 |  |  |  | 646,142 |  |  |  | 756,530 |
Vested |  |  | (751,201 | ) |  |  | (783,872 | ) |  |  | (520,539 | )
Forfeited |  |  | (21,904 | ) |  |  | (15,573 | ) |  |  | (17,793 | )
Restricted stock outstanding as of December 31, |  |  | 2,104,914 |  |  |  | 1,777,429 |  |  |  | 1,930,732 |
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block] |
|  | 201 8 |  |  | 201 7 |  |  | 201 6 |
Performance share awards outstanding as of January 1, |  |  | 235,950 |  |  |  | 197,249 |  |  |  | 202,754 |
Granted (1) |  |  | 297,450 |  |  |  | 135,780 |  |  |  | 100,170 |
Vested (2) |  |  | (100,170 | ) |  |  | (97,079 | ) |  |  | (105,675 | )
Performance share awards outstanding as of December 31, |  |  | 433,230 |  |  |  | 235,950 |  |  |  | 197,249 |
Performance Shares [Member] |
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 201 8 |  |  | 201 7 |  |  | 201 6 |
Stock price |  | $ | 14.99 |  |  | $ | 24.91 |  |  | $ | 26.29 |
Dividend yield (1) |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Risk-free rate |  |  | 2.39 | % |  |  | 1.45 | % |  |  | 0.87 | %
Volatility (2) |  |  | 22.90 | % |  |  | 18.93 | % |  |  | 18.80 | %
Term of the award (years) |  |  | 2.85 |  |  |  | 2.88 |  |  |  | 2.88 |

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