Note 11 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022
Balance	$ 50,701	$ 52,196	$ 52,896	$ 53,785	$ 52,196	$ 53,785
Net other comprehensive income (loss)	(171)	(214)	(1,248)	(486)	(385)	(1,734)
Balance	50,890	50,701	51,925	52,896	50,890	51,925
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance		$ 1,348		$ 3,624	1,348	3,624
Other comprehensive income (loss) before reclassifications					151	(1,290)
Tax effect					(31)	271
Amount reclassified from AOCI					(639)	(905)
Tax effect					134	190
Net other comprehensive income (loss)					(385)	(1,734)
Balance	$ 963		$ 1,890		$ 963	$ 1,890