Note 2 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 10,882
Due in one year or less, Net Carrying Amount	43
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	10,768
Due in one year or less, Fair Value	42
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	27,808
Due after one year through five years, Net Carrying Amount	2,303
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	26,073
Due after one year through five years, Fair Value	2,229
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	47,465
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	3,708
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	42,536
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	3,259
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	51,291
Held-to-maturity Securities	6,054	$ 6,970
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	44,558
Held-to-maturity Securities, Fair Value	5,530	6,294
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	137,446
Available-for-sale Securities, Debt Maturities, Single Maturity Date	123,935
Total available-for-sale securities, Amortized Cost Basis	300,666	317,530
Total available-for-sale securities	264,802	$ 279,605
U.S. Government-sponsored Mortgage-backed and Related Securities [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	163,220
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 140,867