Note 2 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 1,552
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	1,555
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	17,428
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	17,727
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	28,024
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	28,367
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	22,391
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	22,398
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	69,395
Available-for-sale Securities, Debt Maturities, Single Maturity Date	70,047
Available-for-sale Debt Securities, Amortized Cost Basis	141,411	$ 129,748
Securities, available-for-sale	142,086	133,369
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	601
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	620
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	3,658
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	3,709
Held-to-maturity Securities	4,259	3,494
Held-to-maturity Securities, Fair Value	4,329	3,619
U.S. Government-sponsored Mortgage-backed and Related Securities [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	71,861
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	71,507
Pooled Trust Preferred Securities Subject to Mandatory Redemption [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	155
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	532
Available-for-sale Debt Securities, Amortized Cost Basis	155	153
Securities, available-for-sale	$ 532	$ 429