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, 2023		Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Balance as of December 31, 2022	$ (38,678)		$ 2,003	$ (27,982)	$ 4,493
Balance as of December 31, 2022	8,122		(421)	5,876	(943)
Balance as of December 31, 2022	(30,556)		1,582	(22,106)	3,550
Unrealized holding gains on available-for-sale securities arising during the period, before tax	4,670		(16,891)	(6,041)	(19,379)
Unrealized holding gains on available-for-sale securities arising during the period, tax	(981)			1,269	4,070
Unrealized holding gains on available-for-sale securities arising during the period, net	3,689			(4,772)	(15,309)
Amounts reclassified from accumulated other comprehensive income, before tax	2	[1],[2]	0	17	(2)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	0	[1],[2]		4	0
Amounts reclassified from accumulated other comprehensive income, net	2	[1],[2]		13	(2)
Net current period other comprehensive gain, before tax	4,672		(16,891)	(6,024)	(19,381)
Net current period other comprehensive gain, tax	(981)		3,548	1,265	4,070
Net current period other comprehensive gain, net	3,691		(13,343)	(4,759)	(15,311)
Accumulated other comprehensive income (loss), before tax	(34,006)		(14,888)	(34,006)	(14,888)
Accumulated other comprehensive income (loss), tax	7,141		3,127	7,141	3,127
Accumulated other comprehensive income (loss), net	(26,865)		(11,761)	(26,865)	(11,761)
Net current period other comprehensive loss, before tax	4,672		(16,891)	(6,024)	(19,381)
Net current period other comprehensive loss, tax	(981)		3,548	1,265	4,070
Net current period other comprehensive loss, net	3,691		$ (13,343)	(4,759)	(15,311)
Amounts reclassified from accumulated other comprehensive income, tax	$ 0	[1],[2]		$ (4)	$ 0

[1] Income tax expense

[2] Securities (gains) losses, net