Note 11 - Stock and Employee Benefit Plans - Schedule of Share-based Payment Award, Stock Options (Details)	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Share-Based Payment Arrangement, Option [Member]
Risk free interest rate, minimum	1.43%	0.46%
Risk free interest rate, maximum	3.39%	1.20%
Dividend yield	0.00%	0.00%
Expected volatility, minimum	79.90%	75.00%
Expected volatility, maximum	81.10%	81.70%
Share-Based Payment Arrangement, Option [Member] \| Minimum [Member]
Expected term (in years) (Year)	5 years 6 months	5 years 3 months 21 days
Share-Based Payment Arrangement, Option [Member] \| Maximum [Member]
Expected term (in years) (Year)	5 years 8 months 23 days	5 years 8 months 23 days
Employee Stock [Member]
Risk free interest rate, minimum	1.62%	0.04%
Risk free interest rate, maximum	4.60%	0.10%
Expected term (in years) (Year)	6 months	6 months
Dividend yield	0.00%	0.00%
Expected volatility, minimum	53.46%	60.46%
Expected volatility, maximum	70.17%	131.21%

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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The estimated measure of the maximum 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

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- Definition

The estimated measure of the minimum 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

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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