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, 2022	Mar. 31, 2021		Mar. 31, 2022		Mar. 31, 2021
Accumulated other comprehensive income (loss), before tax		$ 2,003	$ 5,733		$ 4,493		$ 5,393
Accumulated other comprehensive income (loss), tax		(421)	(1,204)		(943)		(1,133)
Accumulated other comprehensive income (loss), net		1,582	4,529		3,550		4,260
Net current period other comprehensive loss, before tax		(16,891)	(2,275)		(19,381)		(1,935)
Net current period other comprehensive loss, tax		3,548	478		4,070		407
Other comprehensive income (loss)		(13,343)	(1,797)		(15,311)		(1,528)
Unrealized holding loss on available-for-sale securities arising during the period, before tax		(16,891)	(2,269)		(19,379)		(1,921)
Unrealized holding loss on available-for-sale securities arising during the period, tax			477		4,070		404
Unrealized holding loss on available-for-sale securities arising during the period, net			(1,792)		(15,309)		(1,517)
Amounts reclassified from accumulated other comprehensive income, before tax		0	(6)	[1],[2]	(2)	[1],[2]	(14)	[1],[2]
Amounts reclassified from accumulated other comprehensive income, tax	[1],[2]		1		0		3
Amounts reclassified from accumulated other comprehensive income, net	[1],[2]		(5)		(2)		(11)
Accumulated other comprehensive income (loss), before tax		(14,888)	3,458		(14,888)		3,458
Accumulated other comprehensive income (loss), tax		3,127	(726)		3,127		(726)
Accumulated other comprehensive income (loss), net		$ (11,761)	$ 2,732		$ (11,761)		$ 2,732

[1] Income tax expense

[2] Securities (gains) losses, net