Note 4 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2020
Impaired Financing Receivable, Related Allowance	$ 5		$ 5		$ 34
Impaired Financing Receivable, Unpaid Principal Balance	2,431		2,431		2,195
Impaired Financing Receivable, Recorded Investment	2,074		2,074		1,923
Impaired Financing Receivable, Average Recorded Investment	2,172	$ 1,304	2,094	$ 1,080
Impaired Financing Receivable, Interest Income, Accrual Method	5	7	30	112
Impaired Financing Receivable, Interest Income, Cash Basis Method	5	7	30	112
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	422		422
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	306		306
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	308	14	77	5
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	139		139		176
Impaired Financing Receivable, with Related Allowance, Recorded Investment	140		140		179
Impaired Financing Receivable, Related Allowance	1		1		28
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	142	158	154	164
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	2	2	6	7
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	2	2	6	7
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,073		1,073		922
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	936		936		836
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	941	641	893	415
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	2	1	6	88
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	2	1	6	88
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance					209
Impaired Financing Receivable, with Related Allowance, Recorded Investment					209
Impaired Financing Receivable, Related Allowance					6
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	68	216	160	218
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1	4	7	10
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	1	4	7	10
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	498		498		604
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	456		456		463
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	473	31	577	27
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method			11	7
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method			11	7
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	29		29
Impaired Financing Receivable, with Related Allowance, Recorded Investment	27		27
Impaired Financing Receivable, Related Allowance	4		4
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	29		13
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	270		270		284
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	209		209		$ 236
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	211	244	220	251
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method