Note 3 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 5,642
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	5,712
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	12,346
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	12,800
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	20,295
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	20,824
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	49,976
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	52,688
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	88,259
Available-for-sale Securities, Debt Maturities, Single Maturity Date	92,024
Total available-for-sale securities, Amortized Cost Basis	203,267	$ 138,525
Total available-for-sale securities	207,760	143,918
Due after one year through five years, Net Carrying Amount	294
Due after one year through five years, Fair Value	309
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	5,367
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	5,547
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	2,335
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	2,496
Held-to-maturity Securities	7,996	3,541
Held-to-maturity Securities, Fair Value	8,352	$ 3,868
U.S. Government-sponsored Mortgage-backed and Related Securities [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	115,008
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 115,736