Note 4 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Impaired Financing Receivable, Related Allowance	$ 4	$ 34
Impaired Financing Receivable, Unpaid Principal Balance	2,320	2,195
Impaired Financing Receivable, Recorded Investment	1,954	1,923
Impaired Financing Receivable, Average Recorded Investment	2,096	1,274
Impaired Financing Receivable, Interest Income, Accrual Method	42	122
Impaired Financing Receivable, Interest Income, Cash Basis Method	42	122
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	421
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	303
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	153	4
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	133	176
Impaired Financing Receivable, with Related Allowance, Recorded Investment	134	179
Impaired Financing Receivable, Related Allowance	1	28
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	150	168
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	8	9
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	8	9
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,062	922
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	921	836
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	902	521
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	7	88
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	7	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	120	217
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	7	13
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	7	13
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	409	604
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	367	463
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	539	117
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	20	12
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	20	12
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	16
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	267	284
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	202	236
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	216	247
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method