Note 7 - Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Accumulated other comprehensive income (loss), before tax		$ 2,694	$ (3,549)	$ 1,982	$ (2,069)
Accumulated other comprehensive income (loss), tax		(566)	746	(416)	434
Accumulated other comprehensive income (loss), net		2,128	(2,803)	1,566	(1,635)
Unrealized holding gain on available-for-sale securities arising during the period, before tax		(28)	1,787	790	894
Unrealized holding loss on available-for-sale securities arising during the period, tax		5	(376)	(166)	(188)
Unrealized holding gain (loss) on available-for-sale securities arising during the period, net		(23)	1,411	624	706
Amounts reclassified from accumulated other comprehensive income, before tax	[1],[2]	(4)	27	(110)	(560)
Amounts reclassified from accumulated other comprehensive income, tax	[1],[2]	1	(6)	22	118
Amounts reclassified from accumulated other comprehensive income, net	[1],[2]	(3)	21	(88)	(442)
Net current period other comprehensive income (loss), before tax		(32)	1,814	680	334
Net current period other comprehensive income (loss), tax		6	(382)	(144)	(70)
Other comprehensive income (loss)		(26)	1,432	536	264
Accumulated other comprehensive income (loss), before tax		2,662	(1,735)	2,662	(1,735)
Accumulated other comprehensive income (loss), tax		(560)	364	(560)	364
Accumulated other comprehensive income (loss), net		$ 2,102	$ (1,371)	$ 2,102	$ (1,371)

[1] Income tax expense

[2] Securities (gains) losses, net