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Note 7 - Stock-based Compensation (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Notes Tables |  |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  |  | Three Months |  |  |  | Nine Months |
Risk-free interest rate |  |  | 2.85% - 2.90% |  |  |  | 1.91% - 2.90% |
Dividend yield |  |  | 0 | % |  |  | 0 | %
Expected term (years) |  |  | 3.25 - 6.00 |  |  |  | 3.25 - 6.00 |
Expected volatility |  |  | 45.9% - 48.1% |  |  |  | 45.8% - 48.5% |
|  | 2022 |  |  | 2021 |
Risk-free interest rate |  |  | 1.88% | - | 4.26% |  |  |  | 0.46% | - | .26% |
Dividend yield |  |  |  | 0% |  |  |  |  |  | 0% |  |
Expected term (in years) |  |  | 3.25 | – | 6 |  |  |  | 2.5 | – | 5 |
Expected volatility |  |  | 45.8% | - | 48.1% |  |  |  | 46.0% | - | 92.0% |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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