Employee Benefits - 2017 Omnibus Incentive Plan (Details)	12 Months Ended
	Jun. 30, 2024 USD ($) shares	Jun. 30, 2023 USD ($) shares	Jun. 30, 2022 USD ($) shares	Jun. 30, 2021 shares
Defined Contribution Plan Disclosure [Line Items]
Common stock reserve for issuance	132,000
Granted	23,500	44,000	14,500
Exercised	16,000	0	0
Forfeited	15,000
Outstanding	140,500	148,000	104,000	89,500
Options Exercisable, Number	65,800	63,700	44,900
Equity Incentive Plan vesting percentage	20.00%
Restricted Stock [Member]
Defined Contribution Plan Disclosure [Line Items]
Equity Incentive Plan vesting percentage	20.00%
Omnibus Incentive Plan 2017
Defined Contribution Plan Disclosure [Line Items]
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 | $	$ 1,000,000.0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value | $	704,000
Stock Option Plan Intrinsic Value of Options Vested | $	$ 126,000	$ 42,000	$ 150,000
Options Exercisable, Number	12,600
Full value awards issued	26,600	28,650	22,350
Full value awards vested	16,624	15,140	12,860
Share based compensation expense | $	$ 903,000	$ 833,000	$ 548,000
Unvested compensation cost for full value awards | $	$ 2,500,000
Omnibus Incentive Plan 2017 | Restricted Stock [Member]
Defined Contribution Plan Disclosure [Line Items]
Achievement of specified profitability targets period	3 years
Omnibus Incentive Plan 2017 | Performance-based restricted stock
Defined Contribution Plan Disclosure [Line Items]
Equity Incentive Plan vesting percentage	20.00%
Achievement of specified profitability targets period	3 years
Omnibus Incentive Plan 2017 | Share-Based Payment Arrangement, Tranche One [Member] | Restricted Stock [Member]
Defined Contribution Plan Disclosure [Line Items]
Equity Incentive Plan vesting percentage	20.00%
Omnibus Incentive Plan 2017 | Share-Based Payment Arrangement, Tranche Two [Member] | Restricted Stock [Member]
Defined Contribution Plan Disclosure [Line Items]
Equity Incentive Plan vesting percentage	33.33%