Note 1 - Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share (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
Net Earnings	$ 2,464	$ 2,511	$ 4,190	$ 1,958	$ 3,755	$ 1,611	$ 1,558	$ 1,724	$ 11,123	$ 8,648	$ 9,055
Average common shares outstanding – basic (in shares)									10,279,818	10,399,393	10,459,924
Dilutive stock options using the treasury stock method (in shares)									(33)
Average common shares outstanding – diluted (in shares)									10,279,785	10,399,393	10,459,924
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