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Loans - Major classifications of loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022
Loans and Leases Receivable Disclosure [Line Items]
Deferred loan fees (costs)			$ 653
Total Loans			480,856
Allowance for credit losses			(3,313)	$ (3,337)	$ (3,334)	$ (3,409)
Net Loans			$ 477,543
Deferred loan fees (costs)	$ 586
Total Loans	481,377
Allowance for credit losses	(3,120)	$ (3,601)
Net Loans	$ 478,257
Percentage of loans	100.00%		100.00%
Residential real estate \| 1-4 Family
Loans and Leases Receivable Disclosure [Line Items]
Total Loans			$ 135,046
Allowance for credit losses			(486)	(492)	(514)	(506)
Total Loans	$ 127,992
Allowance for credit losses	$ (325)	(403)	$ (419)
Percentage of loans	26.59%		28.08%
Residential real estate \| Home equity and HELOCs
Loans and Leases Receivable Disclosure [Line Items]
Total Loans			$ 32,684
Allowance for credit losses			(113)	(117)	(109)	(113)
Total Loans	$ 30,669
Allowance for credit losses	$ (160)	(215)	$ (132)
Percentage of loans	6.37%		6.79%
Residential real estate \| Construction -residential
Loans and Leases Receivable Disclosure [Line Items]
Total Loans			$ 9,113
Allowance for credit losses			(214)	(228)	(272)	(386)
Total Loans	$ 12,258
Allowance for credit losses	$ (66)	(44)	$ (40)
Percentage of loans	2.55%		1.90%
Commercial real estate \| 1-4 Family
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 94,297
Allowance for credit losses	(277)
Commercial real estate \| 1 - 4 family investor
Loans and Leases Receivable Disclosure [Line Items]
Total Loans			$ 98,160
Allowance for credit losses			(569)	(486)	(508)	(527)
Total Loans	94,297
Allowance for credit losses	$ (277)	(317)	$ (328)
Percentage of loans	19.58%		20.41%
Commercial real estate \| Multi-family (five or more)
Loans and Leases Receivable Disclosure [Line Items]
Total Loans			$ 15,281
Allowance for credit losses			(89)	(91)	(92)	(110)
Total Loans	$ 15,848
Allowance for credit losses	$ (33)	(52)	$ (59)
Percentage of loans	3.29%		3.18%
Commercial real estate \| Commercial non-residential
Loans and Leases Receivable Disclosure [Line Items]
Total Loans			$ 157,555
Allowance for credit losses			(1,420)	(1,476)	(1,409)	(1,451)
Total Loans	$ 163,830
Allowance for credit losses	$ (1,579)	(1,754)	$ (1,799)
Percentage of loans	34.03%		32.77%
Commercial real estate \| Construction and land
Loans and Leases Receivable Disclosure [Line Items]
Total Loans			$ 15,584
Allowance for credit losses			(281)	(280)	(249)	(166)
Total Loans	$ 19,535
Allowance for credit losses	$ (126)	(240)	$ (188)
Percentage of loans	4.06%		3.24%
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total Loans			$ 15,433
Allowance for credit losses			(82)	(108)	(123)	(100)
Total Loans	$ 14,998
Allowance for credit losses	$ (301)	(322)	$ (336)
Percentage of loans	3.12%		3.21%
Consumer loans
Loans and Leases Receivable Disclosure [Line Items]
Total Loans			$ 2,000
Allowance for credit losses			(59)	$ (59)	$ (58)	$ (50)
Total Loans	$ 1,950
Allowance for credit losses	$ (253)	$ (254)	$ (255)
Percentage of loans	0.41%		0.42%