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Note 8 - Stockholders' Equity - Schedule of Warrant Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020
Outstanding (in shares) | 2,393 | 86 |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 2.40 | $ 5.14 |
Outstanding, Aggregate Fair Market Value | $ 3,747 | $ 3,747 | $ 194
Outstanding, Weighted Average Remaining Contractual Term (Year) | 3 years 7 months 6 days | 4 years 7 months 17 days | 4 years 8 months 26 days
Issued (in shares) |  | 2,307 |
Issued (in dollars per share) |  | $ 2.30 |
Issued |  | $ 3,553 |
Issued (Year) |  | 4 years 7 months 17 days |
Outstanding (in shares) | 2,393 | 2,393 | 86
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 2.40 | $ 2.40 | $ 5.14
Class Of Warrant Or Right, Exercise Price (in dollars per share) | $ 2.40 | $ 2.40 | $ 5.14
Class Of Warrant Or Right, Outstanding (in shares) | 2,393 | 2,393 | 86
Class of Warrant or Rights, Warrants Issued March 26, 2020 [Member] |  |  |
Outstanding (in shares) | 25 |  |
Outstanding (in shares) | 25 | 25 |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 6.25 |  |
Class Of Warrant Or Right, Exercise Price (in dollars per share) | $ 6.25 |  |
Class Of Warrant Or Right, Expiration Date | Mar. 25, 2025 |  |
Class Of Warrant Or Right, Outstanding (in shares) | 25 | 25 |
Class of Warrant or Rights, Warrants Issued March 30, 2020 [Member] |  |  |
Outstanding (in shares) | 61 |  |
Outstanding (in shares) | 61 | 61 |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 4.6875 |  |
Class Of Warrant Or Right, Exercise Price (in dollars per share) | $ 4.6875 |  |
Class Of Warrant Or Right, Expiration Date | Mar. 27, 2025 |  |
Class Of Warrant Or Right, Outstanding (in shares) | 61 | 61 |
Class of Warrant or Rights, Warrants Issued October 23, 2020 [Member] |  |  |
Outstanding (in shares) | 470 |  |
Outstanding (in shares) | 470 | 470 |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 2.88 |  |
Class Of Warrant Or Right, Exercise Price (in dollars per share) | $ 2.88 |  |
Class Of Warrant Or Right, Expiration Date | Oct. 21, 2025 |  |
Class Of Warrant Or Right, Outstanding (in shares) | 470 | 470 |
Class of Warrant or Rights, Warrants Issued October 28, 2020 [Member] |  |  |
Outstanding (in shares) | 173 |  |
Outstanding (in shares) | 173 | 173 |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 2.6875 |  |
Class Of Warrant Or Right, Exercise Price (in dollars per share) | $ 2.6875 |  |
Class Of Warrant Or Right, Expiration Date | Oct. 28, 2025 |  |
Class Of Warrant Or Right, Outstanding (in shares) | 173 | 173 |
Class of Warrant or Rights, Warrants Issued February 16, 2021 [Member] |  |  |
Outstanding (in shares) | 171 |  |
Outstanding (in shares) | 171 | 171 |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 4.06 |  |
Class Of Warrant Or Right, Exercise Price (in dollars per share) | $ 4.06 |  |
Class Of Warrant Or Right, Expiration Date | Feb. 11, 2026 |  |
Class Of Warrant Or Right, Outstanding (in shares) | 171 | 171 |
Class of Warrant or Rights, Warrants Issued April 12, 2021 [Member] |  |  |
Outstanding (in shares) | 1,493 |  |
Outstanding (in shares) | 1,493 | 1,493 |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 1.875 |  |
Class Of Warrant Or Right, Exercise Price (in dollars per share) | $ 1.875 |  |
Class Of Warrant Or Right, Expiration Date | Apr. 07, 2026 |  |
Class Of Warrant Or Right, Outstanding (in shares) | 1,493 | 1,493 |

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