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Note 5 - Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Common Stock Reserved for Future Issuance [Table Text Block] |
|  | Shares |
Stock warrants outstanding |  |  | 13,384,115 |
Stock options outstanding |  |  | 2,058,800 |
Stock options authorized for future grants |  |  | 16,700 |
Total |  |  | 15,459,615 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (yrs) |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2021 |  |  | 962,300 |  |  | $ | 3.18 |  |  |  | 9.3 |  |  | $ | 499,660 |
Granted |  |  | 1,096,500 |  |  |  | 0.76 |  |  |  |  |  |  |  |  |
Exercised |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2022 |  |  | 2,058,800 |  |  | $ | 1.89 |  |  |  | 9.2 |  |  | $ | - |
Exercisable at December 31, 2022 |  |  | 588,089 |  |  | $ | 3.12 |  |  |  | 8.3 |  |  | $ | - |
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
Issue Date |  | Number of Shares |  |  | Exercise Price |  | Expiration
June 2020 |  |  | 120,000 |  |  | $ | 1.65 |  | June 2025
September 2020 |  |  | 2,396,631 |  |  |  | 5.00 |  | September 2025
September 2020 |  |  | 128,000 |  |  |  | 5.50 |  | March 2024
February 2021 |  |  | 72,000 |  |  |  | 6.88 |  | August 2024
September 2021 |  |  | 100,000 |  |  |  | 13.00 |  | September 2026
January 2022 |  |  | 3,067,484 |  |  |  | 3.26 |  | February 2027
May 2022 |  |  | 7,500,000 |  |  |  | 1.65 |  | May 2028
Outstanding at December 31, 2022 |  |  | 13,384,115 |  |  |  |  |  |

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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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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