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Note 7 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Three months ended June 30, |  |  | Six Months ended June 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Risk-free interest rate |  |  | n/a |  |  | 0.77% | - | 0.87% |  |  | 1.91% | - | 2.41% |  |  | 0.46% | - | 0.92% |
Dividend yield |  |  | n/a |  |  |  | 0% |  |  |  |  | 0% |  |  |  |  | 0% |  |
Expected term (years) |  |  | n/a |  |  |  | 5.00 |  |  |  | 5.75 | - | 6.00 |  |  |  | 5.00 |  |
Expected volatility |  |  | n/a |  |  | 47.1% | - | 47.7% |  |  | 45.8% | - | 46.1% |  |  | 47.1% | - | 92.6% |

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