Note 4 - Fair Value - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017
Securities, available-for-sale	$ 136,382	$ 142,086
US Government-sponsored Enterprises Debt Securities [Member]
Securities, available-for-sale	12,519	12,587
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	12,519	12,587
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale
US States and Political Subdivisions Debt Securities [Member]
Securities, available-for-sale	56,886	57,460
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	56,886	57,460
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale
Residential Mortgage Backed Securities [Member]
Securities, available-for-sale	59,344	63,838
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	59,344	63,838
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale
Commercial Mortgage Backed Securities [Member]
Securities, available-for-sale	1,448	1,458
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	1,448	1,458
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale
Collateralized Debt Obligations [Member]
Securities, available-for-sale	5,638	6,211
Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	5,638	6,211
Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale
Pooled Trust Preferred Securities Subject to Mandatory Redemption [Member]
Securities, available-for-sale	547	532
Pooled Trust Preferred Securities Subject to Mandatory Redemption [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
Pooled Trust Preferred Securities Subject to Mandatory Redemption [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	547	532
Pooled Trust Preferred Securities Subject to Mandatory Redemption [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale