Note 4 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Impaired Financing Receivable, Unpaid Principal Balance	$ 558	$ 738
Impaired Financing Receivable, Recorded Investment	405	473
Impaired Financing Receivable, Related Allowance	0	0
Impaired Financing Receivable, Average Recorded Investment	425	1,202
Impaired Financing Receivable, Interest Income, Accrual Method	45	282
Impaired Financing Receivable, Interest Income, Cash Basis Method	45	282
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	404	414
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	314	276
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	306	291
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	37	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	37	0
Impaired Financing Receivable, Related Allowance		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		113
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		6
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		6
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	127	83
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	88	42
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	52	518
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	6	193
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	6	193
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	24	48
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	22
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	38	187
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	2	8
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	2	8
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	3	193
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3	133
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	29	93
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	75
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	$ 0	$ 75