Note 2 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 1,824
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	1,827
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	19,435
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	19,201
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	27,499
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	27,112
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	23,357
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	22,757
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	72,115
Available-for-sale Securities, Debt Maturities, Single Maturity Date	70,897
Available-for-sale Debt Securities, Amortized Cost Basis	141,217	$ 146,097
Securities, available-for-sale	137,668	144,028
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	527
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	521
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	3,402
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	3,444
Held-to-maturity Securities	3,929	4,024
Held-to-maturity Securities, Fair Value	3,965	$ 4,048
U.S. Government-sponsored Mortgage-backed and Related Securities [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	69,102
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 66,771