Note 6 - Accumulated Other Comprehensive Income - Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated other comprehensive income (loss), before tax		$ 741	$ 3,095	$ 675	$ 3,621
Accumulated other comprehensive income (loss), tax		(252)	1,053	(230)	(1,232)
Accumulated other comprehensive income		489	2,042	$ 445	$ 2,389
Unrealized holding gain on available-for-sale securities arising during the period, before tax		104	(423)
Unrealized holding loss on available-for-sale securities arising during the period, tax		(35)	144
Unrealized holding gain on available-for-sale securities arising during the period, net		69	(279)
Amounts reclassified from accumulated other comprehensive income, before tax	[1],[2]	(38)	(103)
Amounts reclassified from accumulated other comprehensive income, tax	[1],[2]	13	35
Amounts reclassified from accumulated other comprehensive income, net	[1],[2]	(25)	(68)
Net current period other comprehensive income (loss), before tax		66	(526)
Net current period other comprehensive loss, tax		(22)	179
Net current period other comprehensive income (loss), net		44	(347)
Unrealized holding gain on available-for-sale securities arising during the period, before tax		104	(423)
Unrealized holding gain on available-for-sale securities arising during the period		(35)	144
Unrealized holding gain on available-for-sale securities arising during the period, net		$ 69	$ (279)

[1] Income tax expense

[2] Securities gain, net