Note 3 - Loans - Loans Past Due (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jun. 30, 2018
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 817	$ 1,090
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due	799	336
Financing Receivable, Recorded Investment, Not Past Due	347,535	318,905
Financing Receivable, Recorded Investment, Total	348,334	319,241
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	18	249
Financing Receivable, Recorded Investment, Past Due	697	256
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	22
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	80	80
Financing Receivable, Recorded Investment, Past Due	80	80
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Total	204,188	188,753
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	458	702
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due	676	238
Financing Receivable, Recorded Investment, Not Past Due	192,276	183,129
Financing Receivable, Recorded Investment, Total	192,952	183,367
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	654	238
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	22
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Financing Receivable, Recorded Investment, Not Past Due	11,236	5,386
Financing Receivable, Recorded Investment, Total	11,236	5,386
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due	27
Financing Receivable, Recorded Investment, Not Past Due	69,779	61,079
Financing Receivable, Recorded Investment, Total	69,806	61,079
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	27
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
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Total	70,344	64,533
Residential Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Financing Receivable, Recorded Investment, Not Past Due	1,974	1,190
Financing Receivable, Recorded Investment, Total	1,974	1,190
Residential Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due
Residential Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due
Residential Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	87	90
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due	95	91
Financing Receivable, Recorded Investment, Not Past Due	53,228	47,738
Financing Receivable, Recorded Investment, Total	53,323	47,829
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	15	11
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	80	80
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	272	298
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due
Financing Receivable, Recorded Investment, Not Past Due	15,047	15,514
Financing Receivable, Recorded Investment, Total	15,047	15,514
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due	1	7
Financing Receivable, Recorded Investment, Not Past Due	3,995	4,869
Financing Receivable, Recorded Investment, Total	3,996	4,876
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	1	7
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due