Note 20 - Stock Option Activity (Details) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares
Stock Option Activity [Abstract]
Shares Under Option, Outstanding \| shares		6,843,079
Shares Under Option, Granted \| shares		2,917,464
Shares Under Option, Exercised \| shares	2,000,000	2,019,187
Shares Under Option, Forfeited \| shares		27,075
Shares Under Option, Outstanding \| shares	7,714,281	7,714,281
Shares Under Option, Exercisable \| shares	6,858,431	6,858,431
Shares Under Option, Expected to vest \| shares	855,850	855,850
Weighted Average Exercise Price Per Share, Outstanding \| $ / shares		$ 10.96
Weighted Average Exercise Price Per Share, Granted \| $ / shares		5.86
Weighted Average Exercise Price Per Share, Exercised \| $ / shares		14.51
Weighted Average Exercise Price Per Share, Forfeited \| $ / shares		12.50
Weighted Average Exercise Price Per Share, Outstanding \| $ / shares	$ 8.09	8.09
Weighted Average Exercise Price Per Share, Exercisable \| $ / shares	8.49	8.49
Weighted Average Exercise Price Per Share, Expected to vest \| $ / shares	$ 4.91	$ 4.91
Weighted Average Remaining Contractual Life, Outstanding		5 years 1 month 2 days
Weighted Average Remaining Contractual Life, Exercisable		4 years 10 months 28 days
Weighted Average Remaining Contractual Life, Expected to vest		6 years 6 months 7 days
Aggregate Intrinsic Value, Outstanding \| $	$ 23	$ 23
Aggregate Intrinsic Value, Exercisable \| $	19	19
Aggregate Intrinsic Value, Expected to vest \| $	$ 4	$ 4

Stock option activity.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of share options (or share units) exercised during the current period.

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