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Employee Benefits - 2003 Stock Option Plan (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
Defined Contribution Plan Disclosure [Line Items] |  |  |
Exercised | 0 | 0 | 0
2003 Stock Option Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Stock Option Plan Description | The Company adopted a stock option plan in October 2003 (the 2003 Plan). Under the plan, the Company granted options to purchase 242,000 shares (split-adjusted) to employees and directors, of which, options to purchase 187,000 shares (split-adjusted) have been exercised, options to purchase 45,000 shares (split-adjusted) have been forfeited, and 10,000 remain outstanding. Under the 2003 Plan, exercised options may be issued from either authorized but unissued shares, or treasury shares. At the 2017 annual meeting, shareholders approved the 2017 Omnibus Incentive Plan, which provided that no further awards would be made under the 2003 Plan. |  |
Granted | 242,000 |  |
Exercised | 187,000 |  |
Forfeited | 45,000 |  |
Outstanding | 10,000 |  |
Stock Option Plan Unrecognized Compensation Expense Related to Nonvested Stock Options | $ 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $ 209,000 |  |
Options vested | 0 | 0 | 0

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- Definition Represents the monetary amount of Stock Option Plan Unrecognized Compensation Expense Related to Nonvested Stock Options, during the indicated time period. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480794/715-70-50-1 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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