Note 4 - Loans - Loans Past Due (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 1,369	$ 1,185
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		41
Financing Receivable, Recorded Investment, Past Due	1,353	1,011
Financing Receivable, Recorded Investment, Not Past Due	562,544	543,786
Financing Receivable, Recorded Investment, Total	563,897	544,797
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	339	127
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		2
Financing Receivable, Recorded Investment, Past Due	16	51
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	998	792
Financing Receivable, Recorded Investment, Past Due	998	833
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		21
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due		21
Financing Receivable, Recorded Investment, Not Past Due	176,319	157,307
Financing Receivable, Recorded Investment, Total	176,319	157,328
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due		21
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Total	248,795	245,957
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	774	785
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due	629	630
Financing Receivable, Recorded Investment, Not Past Due	239,356	229,086
Financing Receivable, Recorded Investment, Total	239,985	229,716
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Financing Receivable, Recorded Investment, Not Past Due	8,810	16,241
Financing Receivable, Recorded Investment, Total	8,810	16,241
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Other Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Other Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due		2
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due	629	628
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Total	116,980	120,119
Residential Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Financing Receivable, Recorded Investment, Not Past Due	5,945	9,435
Financing Receivable, Recorded Investment, Total	5,945	9,435
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	369	143
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		29
Financing Receivable, Recorded Investment, Past Due	603	172
Financing Receivable, Recorded Investment, Not Past Due	90,498	91,102
Financing Receivable, Recorded Investment, Total	91,101	91,274
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	226	236
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due
Financing Receivable, Recorded Investment, Not Past Due	19,934	19,410
Financing Receivable, Recorded Investment, Total	19,934	19,410
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Residential Real Estate Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Past Due	234
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Residential Real Estate Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Real Estate Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Past Due	369	172
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing		12
Financing Receivable, Recorded Investment, Past Due	121	188
Financing Receivable, Recorded Investment, Not Past Due	21,682	21,205
Financing Receivable, Recorded Investment, Total	21,803	21,393
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	105	127
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	16	49
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due		$ 12