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Note 5 - Share-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Risk-Free interest rate |  |  | 0.13% - 0.85% |
Expected dividend yield |  |  | —% |
Expected stock price volatility |  |  | 54.52% - 60.53% |
Expected life of options (in years) |  |  | 2.00 - 6.25 |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Weighted-Average |  |  |  |  |
|  |  |  |  |  | Weighted-Average |  |  | Remaining Contractual |  |  | Aggregate Intrinsic |
|  | Shares |  |  | Exercise Price |  |  | Term (Years) |  |  | Value |
Outstanding at December 31, 2020 |  |  | 4,638,390 |  |  | $ | 2.44 |  |  |  | 5.64 |  |  | $ | 13,701,610 |
Granted (1) |  |  | 770,825 |  |  |  | 5.24 |  |  |  |  |  |  |  |  |
Exercised |  |  | (585,000 | ) |  |  | 1.68 |  |  |  |  |  |  |  |  |
Expired |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Canceled |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Outstanding at September 30, 2021 |  |  | 4,824,215 |  |  | $ | 2.98 |  |  |  | 6.14 |  |  | $ | 12,537,900 |
Exercisable at September 30, 2021 |  |  | 3,500,516 |  |  | $ | 2.37 |  |  |  | 5.28 |  |  | $ | 11,191,507 |
Share-based Payment Arrangement, Activity [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
General and administrative |  | $ | 405,383 |  |  | $ | 354,264 |  |  | $ | 1,183,568 |  |  | $ | 1,125,217 |
Research and development |  |  | 51,826 |  |  |  | 46,417 |  |  |  | 140,832 |  |  |  | 139,016 |
Total |  | $ | 457,209 |  |  | $ | 400,681 |  |  | $ | 1,324,400 |  |  | $ | 1,264,233 |

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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 for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, 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 (d) -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 (e) -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 (c)(1) -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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