Note 2 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 2,170
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	2,192
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	18,053
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	18,167
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	28,838
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	28,992
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	21,409
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	21,466
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	70,470
Available-for-sale Securities, Debt Maturities, Single Maturity Date	70,817
Available-for-sale Debt Securities, Amortized Cost Basis	135,628	$ 141,411
Securities, available-for-sale	135,738	142,086
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	564
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	579
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	3,497
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	3,504
Held-to-maturity Securities	4,061	4,259
Held-to-maturity Securities, Fair Value	4,083	4,329
U.S. Government-sponsored Mortgage-backed and Related Securities [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	64,980
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	64,300
Pooled Trust Preferred Securities Subject to Mandatory Redemption [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	178
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	621
Available-for-sale Debt Securities, Amortized Cost Basis	178	155
Securities, available-for-sale	$ 621	$ 532