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, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Accumulated other comprehensive income (loss), before tax		$ 5,463	$ 2,694	$ 5,393	$ 1,982
Accumulated other comprehensive income (loss), tax		(1,147)	(566)	(1,133)	(416)
Accumulated other comprehensive income (loss), net		4,316	2,128	4,260	1,566
Unrealized holding loss on available-for-sale securities arising during the period, before tax		278	(28)	348	790
Unrealized holding loss on available-for-sale securities arising during the period, tax		(59)	5	(73)	(166)
Unrealized holding loss on available-for-sale securities arising during the period, net		219	(23)	275	624
Amounts reclassified from accumulated other comprehensive income, before tax	[1],[2]	(8)	(4)	(8)	(110)
Amounts reclassified from accumulated other comprehensive income, tax	[1],[2]	2	1	2	22
Amounts reclassified from accumulated other comprehensive income, net	[1],[2]	(6)	(3)	(6)	(88)
Net current period other comprehensive loss, before tax		270	(32)	340	680
Net current period other comprehensive loss, tax		(57)	6	(71)	(144)
Other comprehensive income (loss)		213	(26)	269	536
Accumulated other comprehensive income (loss), before tax		5,733	2,662	5,733	2,662
Accumulated other comprehensive income (loss), tax		(1,204)	(560)	(1,204)	(560)
Accumulated other comprehensive income (loss), net		$ 4,529	$ 2,102	$ 4,529	$ 2,102

[1] Income tax expense

[2] Securities (gains) losses, net