Note 3 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Jun. 30, 2021
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 2,953
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	2,959
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	36,065
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	35,272
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	40,580
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	39,053
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	71,744
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	68,889
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	151,342
Available-for-sale Securities, Debt Maturities, Single Maturity Date	146,173
Total securities available-for-sale, Amortized Cost Basis	303,261	$ 203,267
Total securities available-for-sale, fair value	288,375	207,760
Due after one year through five years, held to maturity, Amortized Cost Basis	253
Due after one year through five years, held to maturity, fair value	254
Due after five years through ten years, held to maturity, Amortized Cost Basis	4,532
Due after five years through ten years, held to maturity, fair value	3,869
Due after ten years, held to maturity, Amortized Cost Basis	2,235
Due after ten years, held to maturity, fair value	2,754
Total securities held-to-maturity, Amortized Cost Basis	7,020	7,996
Total securities, held to maturity, fair value	6,877	$ 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	151,919
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 142,202