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Note 20 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2016 |  |  | 651,544 |  |  | $ | 16.57 |
Granted |  |  | 222,853 |  |  | 9.20 |
Vested |  |  | 399,527 |  |  | 17.56 |
Forfeited |  |  | 6,189 |  |  | 17.26 |
Outstanding on December 31, 2017 |  |  | 468,681 |  |  | 12.21 |
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, 2016 |  |  | 2,214,459 |  |  | $ | 17.10 |  |  |  |  |  |  |
Granted |  |  | 2,605,051 |  |  | 11.93 |  |  |  |  |  |  |
Forfeited |  |  | 11,655 |  |  | 16.80 |  |  |  |  |  |  |
Outstanding on December 31, 2017 |  |  | 4,807,855 |  |  | 14.30 |  |  | 5.75 |  |  | - |
Exercisable on December 31, 2017 |  |  | 1,400,690 |  |  | 18.73 |  |  | 4.31 |  |  | - |
Expected to vest December 31, 2017 |  |  | 3,407,165 |  |  | 12.48 |  |  | 6.28 |  |  | - |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Weighted-average fair value of options granted |  | $ | 2.26 |  |  | $ | 5.56 |  |  | $ | 5.94 |
Weighted-average risk-free interest rate |  | 1.77% |  |  | 1.32% |  |  | 1.46% |
Range of risk-free interest rates |  | 1.64% - 2.11% |  |  | 0.93% - 1.96% |  |  | 1.26% - 1.60% |
Weighted-average expected option lives |  | 4.5 years |  |  | 4.6 years |  |  | 4.5 years |
Expected option lives |  | 4.5 years |  |  | 4.5 - 4.9 years |  |  | 4.5 years |
Weighted-average volatility |  | 46% |  |  | 47% |  |  | 46% |
Range of expected volatilities |  | 46% - 49% |  |  | 44% - 51% |  |  | 40% - 49% |
Weighted-average expected dividend yield |  | 0.0% |  |  | 0.0% |  |  | 0.0% |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&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=96867065&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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