Employee Benefits - 2003 Stock Option Plan (Details) - USD ($)	1 Months Ended	12 Months Ended
	Oct. 31, 2003	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Employee Benefits
Granted		12,000	23,500	44,000
Exercised			16,000
Forfeited			15,000
Outstanding		152,500	140,500	148,000	104,000
2003 Stock Option Plan
Employee Benefits
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	0	10,000	0
Forfeited	45,000
Outstanding		0
Stock Option Plan unrecognized compensation expense related to Nonvested stock options		$ 0
Options vested		0	0	0