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Note 5 - Stockholders' Equity - Schedule of Warrant Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 21, 2022 | Jun. 30, 2021 | Mar. 31, 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 10 months 6 days | 4 years 7 months 17 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 | 2,393
Class of Warrant or Rights, Warrants Issued March 26, 2020 [Member] |  |  |
Outstanding (in shares) | 25 |  |
Outstanding (in shares) |  | 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 |
Class Of Warrant Or Right, Exercise Price (in dollars per share) |  |  | $ 4.69
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 |
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 |
Class Of Warrant Or Right, Exercise Price (in dollars per share) |  |  | $ 2.69
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 |
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 |
Class Of Warrant Or Right, Exercise Price (in dollars per share) |  |  | $ 1.88
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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