Nature of Business and Summary of Significant Accounting Policies - Cash and Cash Equivalents and Investments (Details) - USD ($)	Jun. 30, 2023	Jun. 30, 2022
Accounting policies
Short-term time deposits	$ 15,242,000	$ 63,000
Certificate of deposits, value	15,179,000
Money market fund, Value	63,000	63,000
Cash and Cash Equivalents, at Carrying Value, Total	35,955,000	41,730,000
Investments - other	25,660,000
Certificate of Deposits
Accounting policies
Investments - other	25,660,000
Cash
Accounting policies
Cash and Cash Equivalents, at Carrying Value, Total	20,713,000	41,667,000
Money Market Fund
Accounting policies
Cash and Cash Equivalents, at Carrying Value, Total	63,000	$ 63,000
Certificate of Deposits
Accounting policies
Cash and Cash Equivalents, at Carrying Value, Total	15,179,000
Cash and Cash Equivalents
Accounting policies
Cost	15,112,000
Carrying Value	$ 15,179,000
Cash and Cash Equivalents | Minimum
Accounting policies
Interest Rate	4.59%
Cash and Cash Equivalents | Maximum
Accounting policies
Interest Rate	5.00%
Interest-Bearing Deposits
Accounting policies
Cost	$ 25,359,000
Carrying Value	$ 25,660,000
Interest-Bearing Deposits | Minimum
Accounting policies
Interest Rate	4.80%
Interest-Bearing Deposits | Maximum
Accounting policies
Interest Rate	5.15%