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Note 6 - Equity Incentive Plans - Schedule of Restricted Stock Units Activity (Details) - $ / shares		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Non-vested, Weighted Average Contractual Life (Years)	[1]	5 years 1 month 28 days
The 2021 Plan [Member] | Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of Restricted Stock Units, Non-vested		0	24,195
Number of Restricted Stock Units, Granted		0
Number of Restricted Stock Units, Vested		(23,067)
Number of Restricted Stock Units, Forfeited		(1,128)
Granted, Weighted Average Grant Date Fair Value		$ 0
Vested, Weighted Average Grant Date Fair Value		17.23
Forfeited, Weighted Average Grant Date Fair Value		18.84
Non-vested, Weighted Average Grant Date Fair Value		$ 0	$ 17.3
Non-vested, Weighted Average Contractual Life (Years)			2 years 2 months 1 day
[1] (1) The pre-funded common stock warrants granted and outstanding during the year ended December 31, 2024 have a perpetual term and are therefore excluded from the calculation of the weighted average remaining contractual life.

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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