Income Taxes - Operating loss and credit carryforwards (Details) - USD ($)	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2021
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