Note 4 - Loans - Loans Past Due (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jun. 30, 2019
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 1,097	$ 785
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	13
Financing Receivable, Recorded Investment, Past Due	2,874	320
Financing Receivable, Recorded Investment, Not Past Due	465,975	369,746
Financing Receivable, Recorded Investment, Total	468,849	370,066
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	27	198
Financing Receivable, Recorded Investment, Past Due	2,096	240
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	102
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	663	80
Financing Receivable, Recorded Investment, Past Due	676	80
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	22
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	85,958	80,587
Financing Receivable, Recorded Investment, Total	85,979	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	21
Commercial Portfolio Segment [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]
Financing Receivable, Recorded Investment, Total	246,038	211,367
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	797	436
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due	1,758	199
Financing Receivable, Recorded Investment, Not Past Due	227,624	195,093
Financing Receivable, Recorded Investment, Total	229,382	195,292
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Financing Receivable, Recorded Investment, Not Past Due	16,656	16,075
Financing Receivable, Recorded Investment, Total	16,656	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	1,126	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	4
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	115,209	72,948
Residential Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Financing Receivable, Recorded Investment, Not Past Due	7,497	1,963
Financing Receivable, Recorded Investment, Total	7,497	1,963
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	36	85
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due	772	120
Financing Receivable, Recorded Investment, Not Past Due	87,538	56,347
Financing Receivable, Recorded Investment, Total	88,310	56,467
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	242	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	19,402	14,518
Financing Receivable, Recorded Investment, Total	19,402	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	722	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	15
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	35	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	13
Financing Receivable, Recorded Investment, Past Due	323	1
Financing Receivable, Recorded Investment, Not Past Due	21,300	5,163
Financing Receivable, Recorded Investment, Total	21,623	5,164
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	248	1
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	62
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	$ 13