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Loans - Major classifications of loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 461,140		$ 465,629
Unearned loan origination fees	(800)		(820)
Allowance for loan losses	(3,564)	$ (3,591)	(3,613)	$ (3,587)	$ (3,585)	$ (3,519)
Net Loans	$ 456,776		$ 461,196
Percentage of loans	100.00%		100.00%
Residential real estate \| 1-4 Family
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 156,354		$ 173,306
Allowance for loan losses	$ (605)	(658)	$ (709)	(766)	(731)	(682)
Percentage of loans	33.91%		37.22%
Residential real estate \| Home equity and HELOCs
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 32,201		$ 37,222
Allowance for loan losses	$ (109)	(123)	$ (133)	(130)	(150)	(166)
Percentage of loans	6.98%		7.99%
Residential real estate \| Construction Residential
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 10,264		$ 10,841
Allowance for loan losses	$ (326)	(386)	$ (487)	(463)	(461)	(526)
Percentage of loans	2.22%		2.33%
Commercial real estate \| 1 - 4 family investor
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 114,234		$ 120,581
Allowance for loan losses	$ (742)	(876)	$ (843)	(835)	(859)	(801)
Percentage of loans	24.77%		25.90%
Commercial real estate \| Multi-family (five or more)
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 11,276		$ 12,315
Allowance for loan losses	$ (116)	(148)	$ (159)	(161)	(121)	(123)
Percentage of loans	2.45%		2.64%
Commercial real estate \| Commercial non-residential
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 124,768		$ 96,612
Allowance for loan losses	$ (1,320)	(968)	$ (854)	(851)	(780)	(727)
Percentage of loans	27.06%		20.75%
Commercial real estate \| Construction and Land
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 6,484		$ 6,377
Allowance for loan losses	$ (265)		$ (362)	(334)		(396)
Percentage of loans	1.41%		1.37%
Commercial
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 3,066		$ 5,145
Allowance for loan losses	$ (31)	(49)	$ (51)	(32)	(32)	(83)
Percentage of loans	0.66%		1.10%
Commercial \| Construction and Land
Loans and Leases Receivable Disclosure [Line Items]
Allowance for loan losses	$ (265)	(368)		(334)	(436)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	2,493		$ 3,230
Allowance for loan losses	$ (50)	$ (15)	$ (15)	$ (15)	$ (15)	$ (15)
Percentage of loans	0.54%		0.70%