Note 2 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Jun. 30, 2023
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 10,850
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	10,664
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	27,761
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	22,452
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	32,458
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	32,954
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	67,295
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	58,544
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	138,364
Available-for-sale Securities, Debt Maturities, Single Maturity Date	124,614
Total securities available-for-sale	301,459	$ 317,530
Total securities available-for-sale	265,646	279,605
Due in one year or less, Net Carrying Amount	86
Due in one year or less, Fair Value	85
Due after one year through five years, Net Carrying Amount	2,634
Due after one year through five years, Fair Value	2,555
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	3,708
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	3,201
Total securities held-to-maturity	6,428	6,970
Held-to-maturity Securities, Fair Value	5,841	$ 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	163,095
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 141,032