Note 3 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Jun. 30, 2022
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 5,247
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	5,121
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	29,863
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	28,596
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	52,185
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	46,942
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	69,417
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	62,651
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	156,712
Available-for-sale Securities, Debt Maturities, Single Maturity Date	143,310
Total securities available-for-sale	321,341	$ 324,329
Total securities available-for-sale	287,335	296,347
Due after one year through five years, Net Carrying Amount	171
Due after one year through five years, Fair Value	170
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	3,289
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	3,210
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	3,878
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	3,559
Held-to-maturity Securities	7,338	7,874
Held-to-maturity Securities, Fair Value	6,939	$ 7,831
U.S. Government-sponsored Mortgage-backed and Related Securities [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	164,629
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 144,025