Note 2 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 7,135
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	7,049
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	25,562
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	24,443
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	39,853
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	37,410
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	56,952
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	48,777
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	129,502
Available-for-sale Securities, Debt Maturities, Single Maturity Date	117,679
Total securities available-for-sale	304,224		$ 300,666
Total securities available-for-sale	274,256		264,802
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	1,969
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value	1,890
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	3,535
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value	3,380
Held-to-maturity Securities, Amortized Cost Basis	5,504		6,054
Held-to-maturity Securities, Fair Value	5,270	$ 5,270	$ 5,530
U.S. Government-sponsored Mortgage-backed and Related Securities [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	174,722
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 156,577