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Note 5 - Share-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2023
Notes Tables |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Risk-Free interest rate |  |  | 3.90% - 5.12% |
Expected dividend yield |  |  | —% |
Expected stock price volatility |  |  | 62.22% - 64.27% |
Expected life of options (in years) |  |  | 1.13 - 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, 2022 |  |  | 5,031,097 |  |  | $ | 3.25 |  |  |  | 5.75 |  |  | $ | 13,000 |
Granted (1) |  |  | 800,350 |  |  |  | 1.45 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Expired (2) |  |  | (320,000 | ) |  |  | 1.62 |  |  |  |  |  |  |  |  |
Canceled(3) |  |  | (15,680 | ) |  |  | 3.50 |  |  |  |  |  |  |  |  |
Outstanding at September 30, 2023 |  |  | 5,495,767 |  |  | $ | 3.08 |  |  |  | 5.80 |  |  | $ | 987,330 |
Exercisable at September 30, 2023 |  |  | 4,191,818 |  |  | $ | 3.15 |  |  |  | 5.03 |  |  | $ | 559,251 |
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  |  |  |  |  | Weighted-Average |
|  |  |  |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
Outstanding at December 31, 2022 |  |  | — |  |  | $ | — |
Granted (1) |  |  | 411,005 |  |  |  | 1.38 |
Vested (1) |  |  | (247,961 | ) |  |  | 1.38 |
Outstanding at September 30, 2023 |  |  | 163,044 |  |  | $ | 1.38 |
Share-Based Payment Arrangement, Activity [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
General and administrative |  | $ | 270,672 |  |  | $ | 441,279 |  |  | $ | 913,804 |  |  | $ | 1,219,827 |
Research and development |  |  | 10,635 |  |  |  | 58,640 |  |  |  | 32,458 |  |  |  | 188,383 |
Total |  | $ | 281,307 |  |  | $ | 499,919 |  |  | $ | 946,262 |  |  | $ | 1,408,210 |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Share based compensation expense- stock option |  | $ | 224,749 |  |  | $ | 499,919 |  |  | $ | 779,663 |  |  | $ | 1,408,210 |
Share based compensation expense- restricted stock units |  |  | 56,558 |  |  |  | — |  |  |  | 166,599 |  |  |  | — |
Total |  | $ | 281,307 |  |  | $ | 499,919 |  |  | $ | 946,262 |  |  | $ | 1,408,210 |

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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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -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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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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