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Note 21 - Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Shares |  |  | Weighted-Average Exercise Price Per Share |  |  | Aggregate Intrinsic V alue (in millions) |
Options outstanding, January 1, 2018 |  |  | 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 |
Exercised |  |  | (268,856 | ) |  | $ | 14.43 |  |  | $ | 1.1 |
Forfeited |  |  | (74,574 | ) |  | $ | 20.24 |  |  |  |  |
Options outstanding, December 31, 2019 |  |  | 1,297,936 |  |  | $ | 19.60 |  |  | $ | 2.0 |
Exercised |  |  | (63,365 | ) |  | $ | 15.48 |  |  | $ | 0.2 |
Forfeited |  |  | (72,250 | ) |  | $ | 16.20 |  |  |  |  |
Options outstanding, December 31, 2020 |  |  | 1,162,321 |  |  | $ | 20.03 |  |  | $ | - |
Options exercisable (fully vested) - |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 |  |  | 1,641,366 |  |  | $ | 18.78 |  |  | $ | 0.4 |
December 31, 2019 |  |  | 1,297,936 |  |  | $ | 19.60 |  |  | $ | 2.0 |
December 31, 2020 |  |  | 1,162,321 |  |  | $ | 20.03 |  |  | $ | - |
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Restricted stock outstanding as of January 1, |  |  | 2,367,843 |  |  |  | 2,104,914 |  |  |  | 1,777,429 |
Granted (1) |  |  | 820,150 |  |  |  | 884,170 |  |  |  | 1,100,590 |
Vested |  |  | (784,120 | ) |  |  | (603,148 | ) |  |  | (751,201 | )
Forfeited |  |  | (9,048 | ) |  |  | (18,093 | ) |  |  | (21,904 | )
Restricted stock outstanding as of December 31, |  |  | 2,394,825 |  |  |  | 2,367,843 |  |  |  | 2,104,914 |
Share-based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block] |
|  | 20 20 |  |  | 2019 |  |  | 201 8 |
Performance share awards outstanding as of January 1, |  |  | 704,530 |  |  |  | 433,230 |  |  |  | 235,950 |
Granted (1) |  |  | 506,720 |  |  |  | 407,080 |  |  |  | 297,450 |
Vested (2) |  |  | (297,450 | ) |  |  | (135,780 | ) |  |  | (100,170 | )
Performance share awards outstanding as of December 31, |  |  | 913,800 |  |  |  | 704,530 |  |  |  | 433,230 |
Performance Shares [Member] |
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Stock price |  | $ | 18.93 |  |  | $ | 17.81 |  |  | $ | 14.99 |
Dividend yield (1) |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Risk-free rate |  |  | 1.42 | % |  |  | 2.52 | % |  |  | 2.39 | %
Volatility (2) |  |  | 24.67 | % |  |  | 24.55 | % |  |  | 22.90 | %
Term of the award (years) |  |  | 2.88 |  |  |  | 2.88 |  |  |  | 2.85 |

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