Note 3 - Securities (Details Textual)	3 Months Ended			9 Months Ended
	Mar. 31, 2023 USD ($)		Mar. 31, 2022 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	$ 0	[1],[2]		$ 4,000	$ 0
Debt Securities, Available-for-Sale, Restricted	$ 131,005			$ 131,005		$ 126,679,000
Available-for-sale, Qualitative Disclosure, Number of Positions	381			381
Held-to-maturity, Qualitative Disclosure, Number of Positions	4			4
Equity Securities, FV-NI, Cost	$ 400,000			$ 400,000		$ 400,000
Equity Securities, FV-NI, Realized Gain (Loss), Total	$ 0		$ 0	$ 0	0
US States and Political Subdivisions Debt Securities [Member] | Rated [Member]
Percent of Available for Sale Debt Securities Portfolio	98.70%			98.70%
US States and Political Subdivisions Debt Securities [Member] | Non-rated [Member]
Percent of Available for Sale Debt Securities Portfolio	1.30%			1.30%
Maximum [Member]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	$ (1,000)				$ 1,000

[1] Income tax expense

[2] Securities (gains) losses, net