Note 15 - Share-based Compensation - Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2021	Dec. 31, 2020
Outstanding, number of shares (in shares)	276
Outstanding, weighted average exercise price (in dollars per share)	$ 10.29
Outstanding, weighted average fair value (in dollars per share)	$ 5.44	$ 5.41
Outstanding, weighted average remaining contractual life (Year)	1 year 11 months 8 days	2 years 8 months 1 day
Outstanding, aggregate intrinsic value	$ 6	$ 54
Exercised, number of shares (in shares)	(2)
Exercised, weighted average exercise price (in dollars per share)	$ 6.00
Exercised, weighted average share price on date of exercise (in dollars per share)
Exercised, aggregate intrinsic value	$ 7
Forfeited (in shares)	(4)
Forfeited, weighted average exercise price (in dollars per share)	$ 10.46
Forfeited, weighted average fair value (in dollars per share)	$ 5.64
Forfeited, aggregate intrinsic value	$ 1
Outstanding, number of shares (in shares)	270	276
Outstanding, weighted average exercise price (in dollars per share)	$ 10.32	$ 10.29
Exercisable, number of shares (in shares)	270
Exercisable, weighted average exercise price (in dollars per share)	$ 10.32
Exercisable, weighted average remaining contractual life (Year)	1 year 11 months 8 days
Exercisable, aggregate intrinsic value	$ 6
Vested and expected to vest, number of shares (in shares)	270
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 10.33
Vested and expected to vest, weighted average remaining contractual life (Year)	1 year 11 months 8 days
Vested and expected to vest, aggregate intrinsic value	$ 6

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

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The weighted average share price on the date of exercise for option under share based payment arrangement.

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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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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. 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 exercisable options that may 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 exercisable or convertible options. 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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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 grant-date fair value of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options outstanding.

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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 exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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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