Note 8 - Stock-Based Compensation - Valuation Assumptions (Details) - The 2021 Employee Stock Purchase Plan [Member] - Share-Based Payment Arrangement, Option [Member]	6 Months Ended
Jun. 30, 2026
November 3, 2025 to May 2, 2026 [Member]
Risk-free interest rate	3.71%
Volatility	37.13%
Expected lives (years) (Year)	6 months
May 3, 2025 to November 2, 2025 [Member]
Risk-free interest rate	3.80%
Volatility	37.13%
Expected lives (years) (Year)	6 months
November 3, 2024 to May 2, 2025 [Member]
Risk-free interest rate	4.26%
Volatility	37.13%
Expected lives (years) (Year)	6 months
May 3, 2026 to November 2, 2026 [Member]
Risk-free interest rate	4.30%
Volatility	37.13%
Expected lives (years) (Year)	6 months

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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