Note 3 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 5,362
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	5,382
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	14,540
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	14,802
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	23,261
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	23,727
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	27,220
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	28,605
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	70,383
Available-for-sale Securities, Debt Maturities, Single Maturity Date	72,516
Total available-for-sale securities, Amortized Cost Basis	134,909	$ 142,028
Total available-for-sale securities	137,603	144,010
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	451
Held-to-maturity Securities, Debt Maturities, Year Five Through Ten Years, Fair Value	472
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	3,235
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	3,292
Held-to-maturity Securities	3,686	3,786
Total held-to-maturity securities, Fair Value	3,764	$ 3,821
U.S. Government-sponsored Mortgage-backed and Related Securities [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	64,526
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 65,087