Note 6 - Stock-Based Compensation - Option Assumptions (Details)	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
The 2017 Employee Stock Purchase Plan [Member]
Expected volatility				98.00%
Service-based Options [Member]
Expected term (in years) (Year)		6 years 3 months 18 days
Expected volatility		94.00%
Performance-based and Market-based Options [Member]
Expected volatility	90.00%		90.00%	90.00%
Risk-free interest rate	4.20%		4.20%
Minimum [Member] \| The 2017 Employee Stock Purchase Plan [Member]
Expected term (in years) (Year)			6 months	6 months
Expected volatility			72.00%
Risk-free interest rate			3.60%	4.10%
Minimum [Member] \| Service-based Options [Member]
Expected term (in years) (Year)	5 years 3 months 18 days		5 years 1 month 6 days	5 years
Expected volatility	94.00%		93.00%	93.00%
Risk-free interest rate	3.90%	4.20%	3.70%	4.10%
Minimum [Member] \| Performance-based and Market-based Options [Member]
Expected term (in years) (Year)	6 years 6 months		6 years 6 months	5 years 6 months
Risk-free interest rate				4.40%
Maximum [Member] \| The 2017 Employee Stock Purchase Plan [Member]
Expected term (in years) (Year)			1 year	1 year
Expected volatility			87.00%
Risk-free interest rate			3.70%	4.30%
Maximum [Member] \| Service-based Options [Member]
Expected term (in years) (Year)	6 years 3 months 18 days		6 years 3 months 18 days	6 years 10 months 24 days
Expected volatility	96.00%		96.00%	100.00%
Risk-free interest rate	4.10%	4.30%	4.10%	4.60%
Maximum [Member] \| Performance-based and Market-based Options [Member]
Expected term (in years) (Year)	7 years 2 months 12 days		7 years 2 months 12 days	8 years 10 months 24 days
Risk-free interest rate				4.60%

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.

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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