Note 11 - Fair Value Measurement - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Securities available-for-sale	$ 95,509	$ 95,844
Fair Value, Measurements, Recurring [Member]
Assets, fair value	95,509	95,844
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, fair value	56,761	50,236
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value	38,748	45,608
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, fair value
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Securities available-for-sale	47,721	48,774
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	47,721	48,774
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Securities available-for-sale	13,171	13,385
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	13,171	13,385
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities available-for-sale	25,577	32,223
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	25,577	32,223
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Securities available-for-sale	7,709
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	7,709
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale
Fair Value, Measurements, Recurring [Member] | Mutual Fund Investments [Member]
Securities available-for-sale	1,331	1,462
Fair Value, Measurements, Recurring [Member] | Mutual Fund Investments [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	1,331	1,462
Fair Value, Measurements, Recurring [Member] | Mutual Fund Investments [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale
Fair Value, Measurements, Recurring [Member] | Mutual Fund Investments [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale