Note 3 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 5,366
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	5,401
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	25,848
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	26,285
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	22,183
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	22,527
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	54,229
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	56,360
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	107,626
Available-for-sale Securities, Debt Maturities, Single Maturity Date	110,573
Total securities available-for-sale, Amortized Cost Basis	242,487	$ 203,267
Total securities available-for-sale, fair value	245,414	207,760
Due after one year through five years, held to maturity, Amortized Cost Basis	294
Due after one year through five years, held to maturity, fair value	305
Due after five years through ten years, held to maturity, Amortized Cost Basis	5,367
Due after five years through ten years, held to maturity, fair value	4,854
Due after ten years, held to maturity, Amortized Cost Basis	2,235
Due after ten years, held to maturity, fair value	3,060
Total securities held-to-maturity, Amortized Cost Basis	7,896	7,996
Total securities, held to maturity, fair value	8,219	$ 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	134,861
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 134,841