Note 4 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Impaired Financing Receivable, Related Allowance	$ 1	$ 4	$ 1	$ 4
Impaired Financing Receivable, Unpaid Principal Balance	1,230	2,320	1,230	2,320
Impaired Financing Receivable, Recorded Investment	908	1,954	908	1,954
Impaired Financing Receivable, Average Recorded Investment	1,516	2,211	1,711	2,091
Impaired Financing Receivable, Interest Income, Accrual Method	177	13	184	25
Impaired Financing Receivable, Interest Income, Cash Basis Method	177	13	184	25
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	421	421	421	421
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	294	303	294	303
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	295	150	297	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	2	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	2	0	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	122	133	122	133
Impaired Financing Receivable, with Related Allowance, Recorded Investment	122	134	122	134
Impaired Financing Receivable, Related Allowance	1	1	1	1
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	126		128	160
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	2		4	4
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	2		4	4
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	411	1,062	411	1,062
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	264	921	264	921
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	691	907	802	867
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	99	3	102	4
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	99	3	102	4
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment		0		0
Impaired Financing Receivable, Related Allowance		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		204		205
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		3		6
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		3		6
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	276	409	276	409
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	228	367	228	367
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	272	720	317	629
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	5	3	11
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	1	5	3	11
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		28		28
Impaired Financing Receivable, with Related Allowance, Recorded Investment		27		27
Impaired Financing Receivable, Related Allowance		3		3
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		10		5
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		0		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		0		0
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	267	0	267
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	202	0	202
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	132	220	167	225
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	75	0	75	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	$ 75	$ 0	$ 75	$ 0