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Loans - Major classifications of loans (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 488,865		$ 479,669
Unearned loan origination fees	(670)		(749)
Allowance for loan losses	(3,337)	$ (3,334)	(3,409)	$ (3,479)	$ (3,564)	$ (3,613)
Net Loans	$ 484,858		$ 475,511
Percentage of loans	100.00%		100.00%
Residential real estate \| 1-4 Family
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 139,106		$ 147,061
Allowance for loan losses	$ (492)	(514)	$ (506)	(582)	(605)	(709)
Percentage of loans	28.45%		30.66%
Residential real estate \| Home equity and HELOCs
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 32,567		$ 32,529
Allowance for loan losses	$ (117)	(109)	$ (113)	(128)	(109)	(133)
Percentage of loans	6.67%		6.78%
Residential real estate \| Construction Residential
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 10,138		$ 14,834
Allowance for loan losses	$ (228)	(272)	$ (386)	(349)	(326)	(487)
Percentage of loans	2.07%		3.09%
Commercial real estate \| 1 - 4 family investor
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 98,115		$ 96,850
Allowance for loan losses	$ (486)	(508)	$ (527)	(629)	(742)	(843)
Percentage of loans	20.07%		20.19%
Commercial real estate \| Multi-family (five or more)
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 15,613		$ 13,069
Allowance for loan losses	$ (91)	(92)	$ (110)	(122)	(116)	(159)
Percentage of loans	3.19%		2.72%
Commercial real estate \| Commercial non-residential
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 164,592		$ 158,727
Allowance for loan losses	$ (1,476)	(1,409)	$ (1,451)	(1,378)	(1,320)	(854)
Percentage of loans	33.67%		33.10%
Commercial real estate \| Construction and Land
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 13,898		$ 4,951
Allowance for loan losses	$ (280)	(249)	$ (166)	(186)	(265)	(362)
Percentage of loans	2.84%		1.03%
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 12,692		$ 9,409
Allowance for loan losses	$ (108)	(123)	$ (100)	(55)	(31)	(51)
Percentage of loans	2.60%		1.96%
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 2,144		$ 2,239
Allowance for loan losses	$ (59)	$ (58)	$ (50)	$ (50)	$ (50)	$ (15)
Percentage of loans	0.44%		0.47%