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Note 20 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  | Number of Restricted Stock Units |  |  | Weighted-Average Grant Date Fair Values
Outstanding on December 31, 2015 |  |  | 774,545 |  |  | $19.13
Granted |  |  | 331,195 |  |  | 13.85
Vested |  |  | 395,577 |  |  | 18.89
Forfeited |  |  | 58,619 |  |  | 19.40
Outstanding on December 31, 2016 |  |  | 651,544 |  |  | 16.57
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Shares Under Option |  |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value ($ millions)
Outstanding on December 31, 2015 |  |  | 1,520,795 |  |  | $18.89 |  |  |  |
Granted |  |  | 824,540 |  |  | 13.84 |  |  |  |
Exercised |  |  | 5,797 |  |  | 13.76 |  |  |  |
Forfeited |  |  | 125,079 |  |  | 17.47 |  |  |  |
Outstanding on December 31, 2016 |  |  | 2,214,459 |  |  | 17.10 |  | 5.67 |  | $2
Exercisable on December 31, 2016 |  |  | 717,095 |  |  | 20.28 |  | 5.01 |  | -
Expected to vest December 31, 2016 |  |  | 1,497,364 |  |  | 15.58 |  | 5.99 |  | 2
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Weighted-average fair value of options granted |  | $5.56 |  | $5.94 |  | $7.74
Weighted-average risk-free interest rate |  | 1.32% |  | 1.46% |  | 1.46%
Range of risk-free interest rates |  | 0.93% - 1.96% |  | 1.26% - 1.60% |  | 1.39% - 1.51%
Weighted-average expected option lives |  | 4.6 years |  | 4.5 years |  | 4.5 years
Expected option lives |  | 4.5 - 4.9 years |  | 4.5 years |  | 4.5 years
Weighted-average volatility |  | 47% |  | 46% |  | 39%
Range of expected volatilities |  | 44% - 51% |  | 40% - 49% |  | 36% - 42%
Weighted-average expected dividend yield |  | 0.0% |  | 0.0% |  | 0.0%

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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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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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