Note 3 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Jun. 30, 2021
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 4,097
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	4,118
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	36,803
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	37,108
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	27,403
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	27,540
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	62,691
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	65,252
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	130,994
Available-for-sale Securities, Debt Maturities, Single Maturity Date	134,018
Total securities available-for-sale, Amortized Cost Basis	267,831	$ 203,267
Total securities available-for-sale, fair value	269,836	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	260
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	4,045
Due after ten years, held to maturity, Amortized Cost Basis	2,235
Due after ten years, held to maturity, fair value	2,959
Total securities held-to-maturity, Amortized Cost Basis	7,020	7,996
Total securities, held to maturity, fair value	7,264	$ 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	136,837
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 135,818