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Note 6 - Stock-Based Compensation - Option Assumptions (Details) | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
The 2017 Employee Stock Purchase Plan [Member] |  |
Expected volatility |  | 98.00%
Minimum [Member] | The 2017 Employee Stock Purchase Plan [Member] |  |
Expected term (in years) (Year) | 6 months | 6 months
Expected volatility | 71.70% |
Risk-free interest rate | 3.60% | 4.10%
Maximum [Member] | The 2017 Employee Stock Purchase Plan [Member] |  |
Expected term (in years) (Year) | 1 year | 1 year
Expected volatility | 86.60% |
Risk-free interest rate | 3.70% | 4.30%
Time-based and Performance Options [Member] | Minimum [Member] |  |
Expected term (in years) (Year) | 5 years 1 month 6 days | 5 years
Expected volatility | 93.00% | 93.00%
Risk-free interest rate | 3.70% | 4.10%
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
Expected volatility | 95.00% | 100.00%
Risk-free interest rate | 3.80% | 4.60%
Performance-based and Market-based Options [Member] |  |
Expected volatility |  | 90.00%
Performance-based and Market-based Options [Member] | Minimum [Member] |  |
Expected term (in years) (Year) |  | 5 years 6 months
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%

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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 + Details
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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 + Details
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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 + Details
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