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Income Taxes - Operating loss and credit carryforwards (Details) - USD ($) | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2021
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Federal |  |  |  |
Operating loss carryforwards |  |  |  |
Net operating loss carryforwards | $ 200,000 |  | $ 2,468,000 |
Federal | 2030 |  |  |  |
Operating loss carryforwards |  |  |  |
Net operating loss carryforwards | 6,804,000 |  | 7,560,000 |
Illinois |  |  |  |
Operating loss carryforwards |  |  |  |
Net operating loss carryforwards |  | $ 500,000 |  | $ 100,000
Illinois | 2031 |  |  |  |
Operating loss carryforwards |  |  |  |
Net operating loss carryforwards | 268,469,000 |  | 268,969,000 |
Other state |  |  |  |
Operating loss carryforwards |  |  |  |
Net operating loss carryforwards | 5,790,000 |  | 0 |
Other state | 2036 |  |  |  |
Operating loss carryforwards |  |  |  |
Net operating loss carryforwards | $ 4,724,000 |  | $ 0 |

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