Note 6 - Accumulated Other Comprehensive Income - Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2015	Jun. 30, 2015
Accumulated other comprehensive income (loss), before tax		$ (246)	$ 1,731	$ (246)	$ 1,731	$ 3,095	$ 3,621	$ 2,141	$ 1,363
Accumulated other comprehensive income (loss), tax		83	(589)	83	(589)	(1,053)	(1,232)	(728)	(464)
Accumulated other comprehensive income		(163)	1,142	(163)	1,142	$ 2,042	$ 2,389	$ 1,413	$ 899
Unrealized holding loss on available-for-sale securities arising during the period		(3,319)	(410)	(3,742)	403
Unrealized holding loss on available-for-sale securities arising during the period		1,128	(139)	1,272	137
Unrealized holding loss on available-for-sale securities arising during the period		(2,191)	(271)	(2,470)	266
Amounts reclassified from accumulated other comprehensive income	[1],[2]	(22)		(125)	(35)
Amounts reclassified from accumulated other comprehensive income	[1],[2]	8		43	12
Amounts reclassified from accumulated other comprehensive income	[1],[2]	(14)		(82)	(23)
Net current period other comprehensive income		(3,341)	(410)	(3,867)	368
Net current period other comprehensive income		1,136	139	1,315	(125)
Net current period other comprehensive income		(2,205)	(271)	(2,552)	243
Unrealized holding gain on available-for-sale securities arising during the period		$ (1,128)	$ 139	$ (1,272)	$ (137)

[1] Income tax expense

[2] Securities gain, net