Note 4 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Jun. 30, 2022
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	$ 399
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	556		$ 556		$ 738
Impaired Financing Receivable, Recorded Investment	398		398		473
Impaired Financing Receivable, Related Allowance	0		0		0
Impaired Financing Receivable, Average Recorded Investment		$ 768	405	$ 1,396
Impaired Financing Receivable, Interest Income, Accrual Method		5	34	189
Impaired Financing Receivable, Interest Income, Cash Basis Method		5	34	189
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	399
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		768	405	1,396
Impaired Financing Receivable, Interest Income, Accrual Method		5	34	189
Impaired Financing Receivable, Interest Income, Cash Basis Method		5	34	189
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	407		407		414
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	315		315		276
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	315	289	303	294
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	9	0	27	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	9	0	27	0
Impaired Financing Receivable, Related Allowance					0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	315	289	303	294
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	9	0	27	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	9	0	27	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		120		126
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		2		6
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		2		6
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		120		126
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		2		6
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		2		6
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	78		78		83
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	38		38		42
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	39	255	40	620
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	2	5	104
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	1	2	5	104
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	39	255	40	620
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	2	5	104
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	1	2	5	104
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	44		44		48
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	18		18		22
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	18	91	20	242
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	1	2	4
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	1	2	4
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	18	91	20	242
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	1	2	4
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	1	2	4
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	13	42	114
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	0	0	75
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0	0	75
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	27	13	42	114
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	0	0	75
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	$ 0	$ 0	$ 0	$ 75