Note 2 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jun. 30, 2023
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 11,378
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	11,143
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	25,096
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	24,096
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	51,843
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	46,760
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	53,550
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	48,075
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	141,867
Available-for-sale Securities, Debt Maturities, Single Maturity Date	130,074
Total securities available-for-sale	308,175	$ 317,530
Total securities available-for-sale	276,133	279,605
Due in one year or less, Net Carrying Amount	2,720
Due in one year or less, Fair Value	2,658
Due after one year through five years, Net Carrying Amount	467
Due after one year through five years, Fair Value	457
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	3,241
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	2,785
Total securities held-to-maturity	6,428	6,970
Held-to-maturity Securities, Fair Value	5,900	$ 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	166,308
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 146,059