Note 3 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Jun. 30, 2021
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 850
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	851
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	37,415
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	36,266
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	47,877
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	44,894
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	74,800
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	66,673
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	160,942
Available-for-sale Securities, Debt Maturities, Single Maturity Date	148,684
Total available-for-sale securities, Amortized Cost Basis	324,329	$ 203,267
Total available-for-sale securities	296,347	207,760
Due after one year through five years, Net Carrying Amount	212
Due after one year through five years, Fair Value	212
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	4,212
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	3,522
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	3,450
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	4,097
Held-to-maturity Securities	7,874	7,996
Held-to-maturity Securities, Fair Value	7,831	$ 8,352
U.S. Government-sponsored Mortgage-backed and Related Securities [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	163,387
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 147,663