Note 3 - Investment Securities (Details Textual) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Proceeds from Sale of Available-for-sale Securities, Total	$ 0	$ 0	$ 0	$ 0
Debt Securities, Available-for-sale, Restricted	0		0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Total	$ 0	0	$ 0	0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	33		33
Available-for-sale Securities, Effective Duration			4 years 240 days
Equity Securities, FV-NI, Unrealized Gain (Loss), Total	$ 50		$ 10
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018-02 [Member]
Reclassification of Tax Effect from AOCI to Retained Earnings Due to Tax Cuts and Jobs Act			$ 180