Note 3 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 9,473
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	9,592
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	15,700
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	15,969
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	21,774
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	22,179
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	28,685
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	29,702
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	75,632
Available-for-sale Securities, Debt Maturities, Single Maturity Date	77,442
Available-for-sale Debt Securities, Amortized Cost Basis	142,028	$ 146,097
Securities, available-for-sale	144,010	144,028
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	451
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	471
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	3,350
Held-to-maturity Securities	3,786	4,024
Held-to-maturity Securities, Fair Value	3,821	$ 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	66,396
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 66,568