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, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Accumulated other comprehensive income (loss), before tax	$ (32,042)	$ (38,678)	$ (37,925)	$ (27,982)
Accumulated other comprehensive income (loss), tax	6,729	8,122	7,964	5,876
Accumulated other comprehensive income (loss), net	(25,313)	(30,556)	(29,961)	(22,106)
Unrealized holding losses on available-for-sale securities arising during the period, before tax	(3,772)	4,670	2,032	(6,041)
Unrealized holding losses on available-for-sale securities arising during the period, tax	792	(981)	(426)	1,269
Unrealized holding losses on available-for-sale securities arising during the period, net	(2,980)	3,689	1,606	(4,772)
Amounts reclassified from accumulated other comprehensive income, before tax	1	2	80	17
Amounts reclassified from accumulated other comprehensive income, tax	0	0	(17)	(4)
Amounts reclassified from accumulated other comprehensive income, net	1	2	63	13
Net current period other comprehensive loss, before tax	(3,771)	4,672	2,112	(6,024)
Net current period other comprehensive loss, tax	792	(981)	(443)	1,265
Other comprehensive income	(2,979)	3,691	1,669	(4,759)
Accumulated other comprehensive income (loss), before tax	(35,813)	(34,006)	(35,813)	(34,006)
Accumulated other comprehensive income (loss), tax	7,521	7,141	7,521	7,141
Accumulated other comprehensive income (loss), net	$ (28,292)	$ (26,865)	$ (28,292)	$ (26,865)