Employee Benefits - 2003 Stock Option Plan (Details) - USD ($)	1 Months Ended	12 Months Ended
	Oct. 31, 2003	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Defined Contribution Plan Disclosure [Line Items]
Granted		23,500	44,000	14,500
Exercised		16,000	0	0
Forfeited		15,000
Outstanding		140,500	148,000	104,000	89,500
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 197,000 shares (split-adjusted) have been exercised, and options to purchase 45,000 shares (split-adjusted) have been forfeited. 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	197,000	10,000
Forfeited	45,000
Outstanding		0
Stock Option Plan unrecognized compensation expense related to Nonvested stock options		$ 0
Options vested		0	0	0