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Note 13 - Capital Stock - Share-based Compensation (Details) | 6 Months Ended |
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Jun. 30, 2020 anniversary $ / shares shares | Dec. 31, 2019 $ / shares shares
Performance Based RSUs Equity Settled |  |  |
Number of Shares, Unvested | shares | [1] | 2,224,408 | 2,448,347
Number of Shares, Granted | shares | [2] | 1,175,062 |
Number of Shares, Performance adjustment | shares | [3] | (792,420) |
Number of Shares, Vested in Period | shares | [4] | (591,118) |
Number of Shares, Forfeited | shares |  | (15,463) |
Weighted Average Grant Date Fair Value, Unvested | $ / shares | [1] | $ 14.44 | $ 17.03
Weighted Average Grant Date Fair Value, Granted | $ / shares | [2] | 12.02 |
Weighted Average Grant Date Fair Value, Performance Adjustment | $ / shares | [3] | 0 |
Weighted Average Grant Date Fair Value, Vested | $ / shares | [4] | 17.59 |
Weighted Average Grant Date Fair Value, Forfeited | $ / shares |  | $ 20.00 |
Performance Based RSUs Equity Settled | 2020 Award Year |  |  |
Performance Period, Performance-based RSUs |  | 3 years |
Performance Based RSUs Equity Settled | 2020 Award Year | Maximum |  |  |
Payout Percentage of Target Award |  | 200.00% |
Performance Based RSUs Equity Settled | 2020 Award Year | Minimum |  |  |
Payout Percentage of Target Award |  | 0.00% |
Time Vested RSUs Equity Settled |  |  |
Number of Shares, Unvested | shares | [1] | 957,913 | 697,576
Number of Shares, Granted | shares | [2] | 659,914 |
Number of Shares, Performance adjustment | shares | [3] | 0 |
Number of Shares, Vested in Period | shares | [4] | (395,093) |
Number of Shares, Forfeited | shares |  | (4,484) |
Weighted Average Grant Date Fair Value, Unvested | $ / shares | [1] | $ 16.48 | $ 19.72
Weighted Average Grant Date Fair Value, Granted | $ / shares | [2] | 13.69 |
Weighted Average Grant Date Fair Value, Performance Adjustment | $ / shares | [3] | 0 |
Weighted Average Grant Date Fair Value, Vested | $ / shares | [4] | 17.45 |
Weighted Average Grant Date Fair Value, Forfeited | $ / shares |  | $ 22.87 |
Time Vested RSUs Equity Settled | 2020 Award Year |  |  |
Number of Anniversaries of the Grant Date | anniversary |  | 3 |
Time Vested RSUs Equity Settled | 2020 Award Year | Minimum |  |  |
Cliff-Vesting Period |  | 1 year |
[1] | The final number of RSUs distributed depends on the level of performance achieved along with each employee’s continued service through the vest date, which could result in changes in vested RSUs.
[2] | For performance-based RSUs, amount represents the probable outcome at grant date.
[3] | Represents an adjustment to the number of unvested performance-based RSUs due to changes during the period in our estimated payouts, which can range from 0 to 200% of target depending on results over the applicable performance periods.
[4] | Represents amounts vested during the year, which can include both original shares granted and the impact of performance adjustments.

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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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