Note 19 - Selected Quarterly Financial Data (Unaudited) - Summarized Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Basic earnings per common share (in dollars per share)	$ 0.24	$ 0.24	$ 0.41	$ 0.19	$ 0.37	$ 0.15	$ 0.15	$ 0.16	$ 1.08	$ 0.83	$ 0.87
Diluted earnings per common share (in dollars per share)	0.24	0.24	0.41	0.19	0.37	0.15	0.15	0.16	1.08	0.83	0.87
Dividends declared per common share outstanding (in dollars per share)			$ 0.46				$ 0.44		$ 0.46	$ 0.44	$ 0.42
Total interest income	$ 6,300	$ 7,151	$ 8,553	$ 7,244	$ 8,044	$ 6,837	$ 6,570	$ 6,250	$ 29,248	$ 27,701	$ 23,005
Net interest income after provision for credit losses	5,453	5,305	6,005	5,006	5,981	5,022	4,556	4,457	21,769	20,016	17,885
Non-interest income	1,343	1,776	3,405	915	2,785	497	708	896	7,439	4,886	8,709
Net Earnings	$ 2,464	$ 2,511	$ 4,190	$ 1,958	$ 3,755	$ 1,611	$ 1,558	$ 1,724	$ 11,123	$ 8,648	$ 9,055