Note 7 - Accumulated Other Comprehensive Income (loss) - Changes in Accumulated 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
Balance	$ 38,222	$ 38,427	$ 38,389	$ 36,913
Other comprehensive (loss) income	(701)	(56)	(1,203)	1,010
Balance	37,660	38,506	37,660	38,506
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	40	561	546	(499)
Other comprehensive (loss) before reclassifications	(702)	(15)	(1,149)	1,074
Amounts reclassified from accumulated other comprehensive (loss) income	0	(44)	(59)	(73)
Other comprehensive (loss) income	(702)	(59)	(1,208)	1,001
Balance	(662)	502	(662)	502
AOCI, Accumulated Gain (Loss), Debt Securities, Held-to-maturity, Parent [Member]
Balance	(40)	(51)	(44)	(57)
Other comprehensive (loss) before reclassifications	1	3	5	9
Amounts reclassified from accumulated other comprehensive (loss) income	0	0	0	0
Other comprehensive (loss) income	1	3	5	9
Balance	(39)	(48)	(39)	(48)
AOCI Attributable to Parent [Member]
Balance	0	510	502	(556)
Other comprehensive (loss) before reclassifications	(701)	(12)	(1,144)	1,083
Amounts reclassified from accumulated other comprehensive (loss) income	0	(44)	(59)	(73)
Other comprehensive (loss) income	(701)	(56)	(1,203)	1,010
Balance	$ (701)	$ 454	$ (701)	$ 454