Note 2 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 2,839
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	2,854
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	16,018
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	16,314
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	27,350
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	27,664
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	22,527
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	22,573
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	68,734
Available-for-sale Securities, Debt Maturities, Single Maturity Date	69,405
Available-for-sale Debt Securities, Amortized Cost Basis	135,641	$ 141,411
Securities, available-for-sale	136,382	142,086
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	601
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	626
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	3,563
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	3,632
Held-to-maturity Securities	4,164	4,259
Held-to-maturity Securities, Fair Value	4,258	4,329
U.S. Government-sponsored Mortgage-backed and Related Securities [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	66,726
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	66,430
Pooled Trust Preferred Securities Subject to Mandatory Redemption [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	181
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	547
Available-for-sale Debt Securities, Amortized Cost Basis	181	155
Securities, available-for-sale	$ 547	$ 532