Note 6 - Stockholders' Equity and Stock-based Compensation - Option Assumptions (Details)	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Market-based Options [Member]
Expected volatility		90.00%	90.00%	90.00%
Risk-free interest rate	0.00%	4.40%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Market-based Options [Member] \| Minimum [Member]
Expected term in years (Year)		3 years 8 months 12 days	5 years 6 months	3 years 8 months 12 days
Risk-free interest rate			4.50%	4.20%
Market-based Options [Member] \| Maximum [Member]
Expected term in years (Year)		5 years 9 months 18 days	7 years	5 years 9 months 18 days
Risk-free interest rate			4.60%	4.40%
Performance-based and Market-based Options [Member]
Expected volatility	0.00%		90.00%	0.00%
Risk-free interest rate	0.00%			0.00%
Dividend yield	0.00%		0.00%	0.00%
Performance-based and Market-based Options [Member] \| Minimum [Member]
Expected term in years (Year)			6 years 1 month 6 days
Risk-free interest rate			4.40%
Performance-based and Market-based Options [Member] \| Maximum [Member]
Expected term in years (Year)			8 years 10 months 24 days
Risk-free interest rate			4.60%
Time-based and Performance Options [Member]
Expected term in years (Year)	6 years 3 months 18 days
Expected volatility	94.00%
Risk-free interest rate		4.10%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Time-based and Performance Options [Member] \| Minimum [Member]
Expected term in years (Year)		5 years 3 months 18 days	5 years	5 years 3 months 18 days
Expected volatility		91.00%	93.00%	91.00%
Risk-free interest rate	4.20%		4.10%	4.00%
Time-based and Performance Options [Member] \| Maximum [Member]
Expected term in years (Year)		6 years 3 months 18 days	6 years 10 months 24 days	6 years 3 months 18 days
Expected volatility		95.00%	100.00%	95.00%
Risk-free interest rate	4.30%		4.60%	4.50%

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iv)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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