Note 4 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2022
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	$ 395
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	10
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	10
Impaired Financing Receivable, Unpaid Principal Balance	559		$ 559		$ 738
Impaired Financing Receivable, Recorded Investment	402		402		473
Impaired Financing Receivable, Related Allowance	0		0		0
Impaired Financing Receivable, Average Recorded Investment		$ 1,516	410	$ 1,711
Impaired Financing Receivable, Interest Income, Accrual Method		177	24	184
Impaired Financing Receivable, Interest Income, Cash Basis Method		177	24	184
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	395
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	10
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	10
Impaired Financing Receivable, Average Recorded Investment		1,516	410	1,711
Impaired Financing Receivable, Interest Income, Accrual Method		177	24	184
Impaired Financing Receivable, Interest Income, Cash Basis Method		177	24	184
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	408		408		414
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	315		315		276
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	308	295	297	297
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	8	0	18	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	8	0	18	0
Impaired Financing Receivable, Related Allowance					0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	308	295	297	297
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	8	0	18	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	8	0	18	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		126		128
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		2		4
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		2		4
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		126		128
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		2		4
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		2		4
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	79		79		83
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	40		40		42
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	40	691	40	802
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	99	4	102
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	1	99	4	102
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	40	691	40	802
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	99	4	102
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	1	99	4	102
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	45		45		48
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	20		20		22
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	20	272	20	317
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	1	2	3
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	1	1	2	3
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	20	272	20	317
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	1	2	3
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	1	1	2	3
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	27		27		193
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	27		27		$ 133
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	27	132	53	167
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	75	0	75
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	75	0	75
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	27	132	53	167
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	75	0	75
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	$ 0	$ 75	$ 0	$ 75