Note 9 - Incentive Plans - Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Outstanding at December 31, 2021 (in shares)	13,449,061		11,517,228	9,983,727
Outstanding at December 31, 2021 (in dollars per share)	$ 11.95		$ 12.20	$ 10.19
Outstanding at December 31, 2021 (Year)	6 years 7 months 6 days		7 years 10 months 24 days	8 years 8 months 12 days
Outstanding at December 31, 2021	$ 160,724		$ 128,429	$ 44,395
Awards granted (in shares)	1,949,000		1,564,500
Awards granted (in dollars per share)	$ 10.50		$ 25.09
Shares issued upon options being exercised (in shares)	11,834	12,000	12,000
Exercised (in dollars per share)	$ 12.52		$ 10.00
Forfeitures (in shares)	5,333		18,999
Forfeitures (in dollars per share)	$ 24.83		$ 18.66
Vested at December 31, 2022 (in shares)	13,301,247		11,304,747
Vested at December 31, 2022 (in dollars per share)	$ 11.87		$ 12.02
Vested at December 31, 2022 (Year)	6 years 7 months 6 days		7 years 10 months 24 days
Vested at December 31, 2022	$ 157,820		$ 127,591
Exercisable at December 31, 2022 (in shares)	11,352,247		11,304,747
Exercisable at December 31, 2022 (in dollars per share)	$ 12.10		$ 12.02
Exercisable at December 31, 2022 (Year)	7 years 2 months 12 days		7 years 10 months 24 days
Exercisable at December 31, 2022	$ 137,356		$ 127,591

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 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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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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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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