Income Taxes - Effective tax rate (Details) - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Income Taxes
Federal income tax at statutory rate, Amount	$ 2,139	$ 2,289
Federal income tax at statutory rate, Tax rate	21.00%	21.00%
State income tax, net of federal income tax benefit, Amount	$ 614	$ 930
State income tax, net of federal income tax benefit, Tax rate	6.05%	8.53%
Bank-owned life insurance, Amount	$ (40)	$ (40)
Bank-owned life insurance, Tax Rate	(0.39%)	(0.36%)
Non-deductible expenses, Amount	$ 6	$ 41
Non-deductible expenses, Tax Rate	0.06%	0.37%
Non-deductible stock-based compensation, Amount	$ (30)	$ (10)
Non-deductible stock-based compensation, Tax Rate	(0.30%)	(0.09%)
Excess tax benefit on stock-based compensation, Amount	$ (64)	$ (7)
Excess tax benefit on stock-based compensation, Tax rate	0.00%	(0.07%)
Return to provision adjustment, Amount	$ 0	$ 7
Return to provision adjustment, Tax rate	0.00%	0.06%
Other, Amount	$ 1	$ 3
Other, Tax Rate	(0.64%)	0.02%
Effective income tax, Amount	$ 2,626	$ 3,213
Effective income tax, Tax rate	25.78%	29.46%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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