Note 3 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Jun. 30, 2022
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 4,997
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	4,899
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	29,105
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	27,640
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	51,133
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	44,817
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	63,202
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	55,749
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	148,437
Available-for-sale Securities, Debt Maturities, Single Maturity Date	133,105
Total available-for-sale securities, Amortized Cost Basis	317,530	$ 324,329
Total available-for-sale securities	279,605	296,347
Due after one year through five years, Net Carrying Amount	3,092
Due after one year through five years, Fair Value	2,988
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	533
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	488
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	3,345
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	2,818
Held-to-maturity Securities	6,970	7,874
Held-to-maturity Securities, Fair Value	6,294	$ 7,831
U.S. Government-sponsored Mortgage-backed and Related Securities [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	169,093
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 146,500