Note 7 - Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Accumulated other comprehensive income (loss), before tax		$ 2,662	$ (1,735)	$ 1,982	$ (2,069)
Accumulated other comprehensive income (loss), tax		(560)	364	(416)	434
Accumulated other comprehensive income (loss), net		2,102	(1,371)	1,566	(1,635)
Unrealized holding gain on available-for-sale securities arising during the period, before tax		1,900	1,946	2,690	2,840
Unrealized holding loss on available-for-sale securities arising during the period, tax		(399)	(410)	(566)	(598)
Unrealized holding gain (loss) on available-for-sale securities arising during the period, net		1,501	1,536	2,124	2,242
Amounts reclassified from accumulated other comprehensive income, before tax	[1],[2]	(121)	(1)	(231)	(561)
Amounts reclassified from accumulated other comprehensive income, tax	[1],[2]	26		49	118
Amounts reclassified from accumulated other comprehensive income, net	[1],[2]	(95)	(1)	(182)	(443)
Net current period other comprehensive income (loss), before tax		1,779	1,945	2,459	2,279
Net current period other comprehensive income (loss), tax		(373)	(410)	(517)	(480)
Other comprehensive income (loss)		1,406	1,535	1,942	1,799
Accumulated other comprehensive income (loss), before tax		4,441	210	4,441	210
Accumulated other comprehensive income (loss), tax		(933)	(46)	(933)	(46)
Accumulated other comprehensive income (loss), net		$ 3,508	$ 164	$ 3,508	$ 164

[1] Income tax expense

[2] Securities (gains) losses, net