Nature of Business and Summary of Significant Accounting Policies - Cash and Cash Equivalents and Investments (Details) - USD ($)	Mar. 31, 2023	Jun. 30, 2022
Accounting policies
Short-term time deposits	$ 10,225,000	$ 63,000
Certificate of deposits, value	10,162,000
Money market fund, Value	63,000	63,000
Cash and Cash Equivalents, at Carrying Value, Total	31,515,000	41,730,000
Investments - other	20,271,000
Certificate of Deposits
Accounting policies
Investments - other	20,271,000
Cash
Accounting policies
Cash and Cash Equivalents, at Carrying Value, Total	21,290,000	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	10,162,000
Cash and Cash Equivalents
Accounting policies
Cost	$ 10,000,000
Cash and Cash Equivalents \| Minimum
Accounting policies
Interest Rate	4.55%
Cash and Cash Equivalents \| Maximum
Accounting policies
Interest Rate	4.70%
Cash and Cash Equivalents \| Carrying Value
Accounting policies
Carrying Value	$ 10,162,000
Interest-Bearing Deposits
Accounting policies
Cost	$ 20,185,000
Interest-Bearing Deposits \| Minimum
Accounting policies
Interest Rate	4.75%
Interest-Bearing Deposits \| Maximum
Accounting policies
Interest Rate	4.90%
Interest-Bearing Deposits \| Carrying Value
Accounting policies
Carrying Value	$ 20,271,000

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Rate of interest on investment.

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Amount of short-term investments classified as other.

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Any certificate of deposit or savings account held by a bank or other financial institution for a short-term specified period of time. Because of their short-term, time deposits are considered highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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