Nature of Business and Summary of Significant Accounting Policies - Cash and Cash Equivalents and Investments (Details) - USD ($)	Dec. 31, 2023	Jun. 30, 2023
Accounting policies
Short-term time deposits	$ 25,838,000	$ 15,242,000
Cash	21,474,000	20,713,000
Certificate of Deposits	5,275,000	15,179,000
Money Market Fund	20,562,000	63,000
Cash and Cash Equivalents, at Carrying Value, Total	47,311,000	35,955,000
Investments - other	26,332,000	25,660,000
Certificate of Deposits
Accounting policies
Investments - other	$ 26,332,000	$ 25,660,000
Cash and Cash Equivalents
Accounting policies
Interest Rate	5.10%
Cost	$ 5,245,000
Cash and Cash Equivalents | Minimum
Accounting policies
Interest Rate	5.10%
Cash and Cash Equivalents | Carrying Value
Accounting policies
Carrying Value	$ 5,275,000
Interest-Bearing Deposits
Accounting policies
Cost	$ 26,015,000
Interest-Bearing Deposits | Minimum
Accounting policies
Interest Rate	5.10%
Interest-Bearing Deposits | Maximum
Accounting policies
Interest Rate	5.40%
Interest-Bearing Deposits | Carrying Value
Accounting policies
Carrying Value	$ 26,332,000