Employee Benefits - 2003 Stock Option Plan (Details) - USD ($)	12 Months Ended
	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