Note 4 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Jun. 30, 2021
Impaired Financing Receivable, Related Allowance	$ 1		$ 1		$ 4
Impaired Financing Receivable, Unpaid Principal Balance	1,016		1,016		2,320
Impaired Financing Receivable, Recorded Investment	705		705		1,954
Impaired Financing Receivable, Average Recorded Investment	768	$ 2,172	1,396	$ 2,094
Impaired Financing Receivable, Interest Income, Accrual Method	5	5	189	30
Impaired Financing Receivable, Interest Income, Cash Basis Method	5	5	189	30
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	421		421		421
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	289		289		303
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	289	308	294	77
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	0	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0	0	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	116		116		133
Impaired Financing Receivable, with Related Allowance, Recorded Investment	116		116		134
Impaired Financing Receivable, Related Allowance	1		1		1
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	120	142	126	154
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	2	2	6	6
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	2	2	6	6
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	401		401		1,062
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	250		250		921
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	255	941	620	893
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	2	2	104	6
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	2	2	104	6
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance					0
Impaired Financing Receivable, with Related Allowance, Recorded Investment					0
Impaired Financing Receivable, Related Allowance					0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		68		160
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		1		7
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		1		7
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	51		51		409
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	23		23		367
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	91	473	242	577
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	0	4	11
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	1	0	4	11
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance					28
Impaired Financing Receivable, with Related Allowance, Recorded Investment					27
Impaired Financing Receivable, Related Allowance					3
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		29		13
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	27		27		267
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	27		27		$ 202
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	13	211	114	220
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	0	75	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	$ 0	$ 0	$ 75	$ 0