Note 4 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Impaired Financing Receivable, Related Allowance	$ 0	$ 4
Impaired Financing Receivable, Unpaid Principal Balance	738	2,320
Impaired Financing Receivable, Recorded Investment	473	1,954
Impaired Financing Receivable, Average Recorded Investment	1,202	2,096
Impaired Financing Receivable, Interest Income, Accrual Method	282	42
Impaired Financing Receivable, Interest Income, Cash Basis Method	282	42
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	414	421
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	276	303
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	291	153
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0	133
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	134
Impaired Financing Receivable, Related Allowance	0	1
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	113	150
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	6	8
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	6	8
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	83	1,062
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	42	921
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	518	902
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	193	7
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	193	7
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		120
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		7
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		7
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	48	409
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	22	367
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	187	539
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	8	20
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	8	20
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		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		0
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	193	267
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	133	202
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	93	216
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	75	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	$ 75	$ 0