Note 4 - Loans - Loans Past Due (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 1,185	$ 785
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	41
Financing Receivable, Recorded Investment, Past Due	1,011	320
Financing Receivable, Recorded Investment, Not Past Due	543,786	369,746
Financing Receivable, Recorded Investment, Total	544,797	370,066
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		198
Financing Receivable, Recorded Investment, Past Due	127	240
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	2
Financing Receivable, Recorded Investment, Past Due	51
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	792	80
Financing Receivable, Recorded Investment, Past Due	833	80
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	157,307	80,587
Financing Receivable, Recorded Investment, Total	157,328	80,587
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	245,957	211,367
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	785	436
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due	630	199
Financing Receivable, Recorded Investment, Not Past Due	229,086	195,093
Financing Receivable, Recorded Investment, Total	229,716	195,292
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Financing Receivable, Recorded Investment, Not Past Due	16,241	16,075
Financing Receivable, Recorded Investment, Total	16,241	16,075
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		199
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	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	120,119	72,948
Residential Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Financing Receivable, Recorded Investment, Not Past Due	9,435	1,963
Financing Receivable, Recorded Investment, Total	9,435	1,963
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	143	85
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	29
Financing Receivable, Recorded Investment, Past Due	172	120
Financing Receivable, Recorded Investment, Not Past Due	91,102	56,347
Financing Receivable, Recorded Investment, Total	91,274	56,467
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	236	264
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due
Financing Receivable, Recorded Investment, Not Past Due	19,410	14,518
Financing Receivable, Recorded Investment, Total	19,410	14,518
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		40
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	172	80
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	188	1
Financing Receivable, Recorded Investment, Not Past Due	21,205	5,163
Financing Receivable, Recorded Investment, Total	21,393	5,164
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	127	1
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	49
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	$ 12