Nature of Business and Summary of Significant Accounting Policies - Cash and Cash Equivalents and Investments (Details) - USD ($)	Sep. 30, 2023	Jun. 30, 2023
Accounting policies
Short-term time deposits	$ 15,630,000	$ 15,242,000
Cash	27,947,000	20,713,000
Certificate of Deposits	15,366,000	15,179,000
Money Market Fund	264,000	63,000
Cash and Cash Equivalents, at Carrying Value, Total	43,577,000	35,955,000
Investments - other	25,931,000	25,660,000
Certificate of Deposits
Accounting policies
Investments - other	25,931,000	$ 25,660,000
Cash and Cash Equivalents
Accounting policies
Cost	$ 15,312,000
Cash and Cash Equivalents | Minimum
Accounting policies
Interest Rate	4.77%
Cash and Cash Equivalents | Maximum
Accounting policies
Interest Rate	5.25%
Cash and Cash Equivalents | Carrying Value
Accounting policies
Carrying Value	$ 15,366,000
Interest-Bearing Deposits
Accounting policies
Cost	$ 25,706,000
Interest-Bearing Deposits | Minimum
Accounting policies
Interest Rate	5.00%
Interest-Bearing Deposits | Maximum
Accounting policies
Interest Rate	5.40%
Interest-Bearing Deposits | Carrying Value
Accounting policies
Carrying Value	$ 25,931,000