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Note 7 - Related-party Debt (Details Textual) - USD ($) $ in Thousands |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 05, 2022 | Sep. 03, 2021 | Jun. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2022 | Feb. 13, 2020 | Sep. 05, 2019
Interest Paid, Excluding Capitalized Interest, Operating Activities |  |  | $ 26 | $ 69 |  |  |
Secured Promissory Note (2019 Note) [Member] |  |  |  |  |  |  |
Repayments of Debt | $ 500 | $ 1,000 |  |  |  |  |
Interest Paid, Excluding Capitalized Interest, Operating Activities | $ 55 | 330 |  |  |  |  |
Notes Payable, Total |  |  |  |  | $ 500 |  |
Secured Promissory Note (2019 Note) [Member] | Chief Executive Officer and Board of Directors Chairman, Thomas B. Pickens III [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 1,500
Secured Promissory Note, (2020 Note) [Member] |  |  |  |  |  |  |
Repayments of Debt |  | 1,000 |  |  |  |  |
Interest Paid, Excluding Capitalized Interest, Operating Activities |  | $ 172 |  |  |  |  |
Secured Promissory Note, (2020 Note) [Member] | Chief Executive Officer and Board of Directors Chairman, Thomas B. Pickens III [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 1,000 |
Secured Promissory Notes, "Original Notes" [Member] | Chief Executive Officer and Board of Directors Chairman, Thomas B. Pickens III [Member] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 11.00% |

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