Note 2 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jun. 30, 2018
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 3,591
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	3,597
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	18,177
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	18,290
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	25,489
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	25,708
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	27,641
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	28,110
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	74,898
Available-for-sale Securities, Debt Maturities, Single Maturity Date	75,705
Available-for-sale Debt Securities, Amortized Cost Basis	141,442	$ 146,097
Securities, available-for-sale	141,652	144,028
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	489
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	501
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	3,335
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	3,360
Held-to-maturity Securities	3,824	4,024
Held-to-maturity Securities, Fair Value	3,861	$ 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	66,544
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 65,947