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Note 5 - Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2022
Notes Tables |
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Aggregate Fair |  |  | Weighted Average |
|  | Number of Shares |  |  |  |  |  |  | Market Value at |  |  | Remaining |
|  | Underlying Warrants |  |  | Weighted Average |  |  | Issuance (In |  |  | Contractual Term |
|  | (In thousands) |  |  | Exercise Price |  |  | thousands) |  |  | (Years) |
Outstanding June 30, 2021 |  |  | 2,393 |  |  | $ | 2.40 |  |  | $ | 3,747 |  |  |  | 4.63 |
Warrants issued |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Warrants exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Warrants expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Outstanding March 31, 2022 |  |  | 2,393 |  |  | $ | 2.40 |  |  | $ | 3,747 |  |  |  | 3.85 |
|  |  |  |  |  |  |  |  | Number of Shares Underlying Warrants (In thousands) |
Issue Date |  | Classification |  | Exercise Price |  | Expiration Date |  | March 31, 2022 |  |  | June 30, 2021 |
March 26, 2020 |  | Equity |  | $ | 6.25 |  | March 25, 2025 |  |  | 25 |  |  |  | 25 |
March 30, 2020 |  | Equity |  | $ | 4.69 |  | March 27, 2025 |  |  | 61 |  |  |  | 61 |
October 23, 2020 |  | Equity |  | $ | 2.88 |  | October 21, 2025 |  |  | 470 |  |  |  | 470 |
October 28, 2020 |  | Equity |  | $ | 2.69 |  | October 28, 2025 |  |  | 173 |  |  |  | 173 |
February 16, 2021 |  | Equity |  | $ | 4.06 |  | February 11, 2026 |  |  | 171 |  |  |  | 171 |
April 12, 2021 |  | Equity |  | $ | 1.88 |  | April 7, 2026 |  |  | 1,493 |  |  |  | 1,493 |
Total Outstanding |  |  |  |  |  |  |  | 2,393 |  |  |  | 2,393 |

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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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