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Note 7 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Share-based Payment Arrangement, Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Weighted |
|  |  |  |  |  |  |  |  |  | Average |
|  | Awards |  |  | Options |  |  | Exercise |
|  | Available |  |  | Outstanding |  |  | Price |
Balance December 31, 2020 |  |  | 4,592 |  |  |  | 24,885 |  |  | $ | 6.52 |
Plan amendment |  |  | 7,500 |  |  |  | - |  |  |  | - |
Restricted stock unit awards granted |  |  | (100 | ) |  |  | - |  |  |  | - |
Stock option awards granted |  |  | (2,108 | ) |  |  | 2,108 |  |  |  | 11.87 |
Stock option awards exercised |  |  | - |  |  |  | (2,205 | ) |  |  | 4.11 |
Stock option awards cancelled |  |  | 208 |  |  |  | (208 | ) |  |  | 7.47 |
Balance September 30, 2021 |  |  | 10,092 |  |  |  | 24,580 |  |  | $ | 7.18 |
|  |  |  |  |  |  |  |  |  | Weighted |
|  |  |  |  |  |  |  |  |  | Average |
|  | Awards |  |  | Options |  |  | Exercise |
|  | Available |  |  | Outstanding |  |  | Price |
Balance December 31, 2020 |  |  | 229 |  |  |  | 4,171 |  |  | $ | 3.88 |
Plan amendment |  |  | 1,500 |  |  |  | - |  |  |  | - |
Stock option awards granted |  |  | (738 | ) |  |  | 738 |  |  |  | 14.23 |
Stock option awards exercised |  |  | - |  |  |  | (386 | ) |  |  | 3.61 |
Stock option awards cancelled |  |  | 122 |  |  |  | (122 | ) |  |  | 3.86 |
Balance September 30, 2021 |  |  | 1,113 |  |  |  | 4,401 |  |  | $ | 5.64 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2021 |  |  | 2020 |
Expected Life in Years |  |  | 5.5 |  |  |  | 5.5 |
Expected Volatility |  |  | 84.2 | % |  |  | 83.8 | %
Expected Dividend Yield |  |  | 0.0 | % |  |  | 0.0 | %
Risk-Free Interest Rate |  |  | 0.8 | % |  |  | 0.4 | %

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + 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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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