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Note 5 - Stockholders' Equity - Schedule of Warrant Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Jun. 30, 2022
Outstanding (in shares) | 2,393 |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 2.40 |
Outstanding, Aggregate Fair Market Value | $ 3,747 | $ 3,747
Outstanding, Weighted Average Remaining Contractual Term (Year) | 3 years 4 months 6 days | 3 years 7 months 6 days
Warrants issued (in shares) | 0 |
Warrants issued, Weighted Average Exercise Price (in dollars per share) | $ 0 |
Warrants issued, Aggregate Fair Market Value | $ 0 |
Warrants exercised (in shares) | 0 |
Warrants exercised, Weighted Average Exercise Price (in dollars per share) | $ 0 |
Warrants exercised, Aggregate Fair Market Value | $ 0 |
Warrants expired (in shares) | 0 |
Warrants expired,Weighted Average Exercise Price (in dollars per share) | $ 0 |
Warrants expired, Aggregate Fair Market Value | $ 0 |
Outstanding (in shares) | 2,393 | 2,393
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 2.40 | $ 2.40
Class Of Warrant Or Right, Exercise Price (in dollars per share) | $ 2.40 | $ 2.40
Class Of Warrant Or Right, Outstanding (in shares) | 2,393 | 2,393
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, 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) | $ 4.69 |
Class Of Warrant Or Right, Exercise Price (in dollars per share) | $ 4.69 |
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, 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) | $ 2.69 |
Class Of Warrant Or Right, Exercise Price (in dollars per share) | $ 2.69 |
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, 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) | $ 1.88 |
Class Of Warrant Or Right, Exercise Price (in dollars per share) | $ 1.88 |
Class Of Warrant Or Right, Outstanding (in shares) | 1,493 | 1,493

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