Note 8 - Share-based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2026	Dec. 31, 2025
Stock options outstanding, options (in shares)	485,203
Balance, weighted average exercise price, beginning of period (in dollars per share)	$ 17.19
Stock options outstanding, weighted average remaining contractual term (Year)	8 years 1 month 6 days	8 years 4 months 24 days
Stock options outstanding, aggregate intrinsic value	$ 0	$ 0
Stock options granted, options (in shares)	30,000
Stock options granted, weighted average exercise price (in dollars per share)	$ 1.29
Stock options forfeited, options (in shares)	(12,271)
Stock options forfeited, weighted average exercise price (in dollars per share)	$ 11.24
Outstanding, March 31, 2026 (in shares)	502,932	485,203
Outstanding, March 31, 2026 (in dollars per share)	$ 16.38	$ 17.19
Stock options exercisable, options (in shares)	170,648
Stock options exercisable, weighted average exercise price, ending of period (in dollars per share)	$ 44.7
Stock options exercisable weighted average remaining contractual term (Year)	5 years 6 months
Stock options exercisable, aggregate intrinsic value	$ 0

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

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

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