Employee Benefits - 2017 Omnibus Incentive Plan (Details)	12 Months Ended
	Jun. 30, 2025 USD ($) shares	Jun. 30, 2024 USD ($) shares	Jun. 30, 2023 USD ($) shares	Jun. 30, 2022 shares
Employee Benefits
Common stock reserve for issuance	132,000
Granted	12,000	23,500	44,000
Exercised		16,000
Forfeited		15,000
Outstanding	152,500	140,500	148,000	104,000
Options Exercisable, Number	88,500	65,800	63,700
Restricted Stock
Employee Benefits
Equity Incentive Plan vesting percentage	20.00%
Period for recognition of compensation expense from the date of grant on pro-rata basis	5 years
Performance-based restricted stock
Employee Benefits
Equity Incentive Plan vesting percentage	20.00%
Achievement of specified profitability targets period	3 years
Omnibus Incentive Plan 2017
Employee Benefits
2017 Omnibus Incentive Plan Description	The Company adopted an equity-based incentive plan in October 2017 (the 2017 Plan). Under the 2017 plan, the Company reserved for issuance 500,000 shares of common stock for awards to employees and directors, against which full value awards (stock-based awards other than stock options and stock appreciation rights) are to be counted on a 2.5-for-1 basis. The 2017 Plan authorized awards to be made to employees, officers, and directors by a committee of outside directors. The committee held the power to set vesting requirements for each award under the 2017 Plan. Under the 2017 Plan, stock awards and shares issued pursuant to exercised options may be issued from either authorized but unissued shares, or treasury shares.
Common stock reserve for issuance	500,000
Full value awards basis	2.5
Granted	161,500
Exercised	6,000
Forfeited	15,000
Outstanding	140,500
Unrecognized compensation cost | $	$ 1,000,000
Outstanding options, intrinsic value | $	1,500,000
Intrinsic value of options vested | $	$ 218,000	$ 126,000	$ 42,000
Options Exercisable, Number	6,900
Full value awards issued	0	26,600	28,650
Full value awards vested	29,523	16,624	15,140
Share based compensation expense | $	$ 845,000	$ 903,000	$ 833,000
Unvested compensation cost for full value awards | $	$ 1,600,000
Omnibus Incentive Plan 2017 | Restricted Stock
Employee Benefits
Achievement of specified profitability targets period	3 years
Omnibus Incentive Plan 2017 | Performance-based restricted stock
Employee Benefits
Equity Incentive Plan vesting percentage	20.00%
Achievement of specified profitability targets period	3 years
Omnibus Incentive Plan 2017 | Per Year | Restricted Stock
Employee Benefits
Equity Incentive Plan vesting percentage	20.00%
Omnibus Incentive Plan 2017 | Tranche two | Restricted Stock
Employee Benefits
Equity Incentive Plan vesting percentage	33.33%