Note 4 - Loans - Loans Past Due (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jun. 30, 2019
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 427	$ 785
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	191
Financing Receivable, Recorded Investment, Past Due	557	320
Financing Receivable, Recorded Investment, Not Past Due	396,698	369,746
Financing Receivable, Recorded Investment, Total	397,255	370,066
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		198
Financing Receivable, Recorded Investment, Past Due	357	240
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	9
Financing Receivable, Recorded Investment, Past Due	9
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		80
Financing Receivable, Recorded Investment, Past Due	191	80
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Total	232,429	211,367
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	176	436
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	191
Financing Receivable, Recorded Investment, Past Due	197	199
Financing Receivable, Recorded Investment, Not Past Due	216,027	195,093
Financing Receivable, Recorded Investment, Total	216,224	195,292
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		199
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	6
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	191
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Financing Receivable, Recorded Investment, Not Past Due	16,205	16,075
Financing Receivable, Recorded Investment, Total	16,205	16,075
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
Financing Receivable, Recorded Investment, Not Past Due	76,416	80,587
Financing Receivable, Recorded Investment, Total	76,416	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
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Total	81,924	72,948
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	3	85
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing
Financing Receivable, Recorded Investment, Past Due	345	120
Financing Receivable, Recorded Investment, Not Past Due	61,670	56,347
Financing Receivable, Recorded Investment, Total	62,015	56,467
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	342	40
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	3
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
Residential Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due	1
Financing Receivable, Recorded Investment, Not Past Due	4,802	1,963
Financing Receivable, Recorded Investment, Total	4,803	1,963
Residential Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	1
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 Non-owner Occupied Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	248	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	15,106	14,518
Financing Receivable, Recorded Investment, Total	15,106	14,518
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	14	1
Financing Receivable, Recorded Investment, Not Past Due	6,472	5,163
Financing Receivable, Recorded Investment, Total	6,486	5,164
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due	14	1
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