Note 2 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 6,575
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	6,445
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	26,884
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	25,275
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	52,244
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	45,075
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	57,076
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	45,987
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	142,779
Available-for-sale Securities, Debt Maturities, Single Maturity Date	122,782
Total securities available-for-sale	308,728	$ 317,530
Total securities available-for-sale	261,030	279,605
Due after one year through five years, Net Carrying Amount	3,092
Due after one year through five years, Fair Value	2,954
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	518
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	3,241
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	2,651
Held-to-maturity Securities	6,866	6,970
Held-to-maturity Securities, Fair Value	6,123	$ 6,294
U.S. Government-sponsored Mortgage-backed and Related Securities [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	165,949
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 138,248