Note 4 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022
Impaired Financing Receivable, Unpaid Principal Balance	$ 565		$ 738
Impaired Financing Receivable, Recorded Investment	383		473
Impaired Financing Receivable, Related Allowance	0		0
Impaired Financing Receivable, Average Recorded Investment	410	$ 1,907
Impaired Financing Receivable, Interest Income, Accrual Method	14	7
Impaired Financing Receivable, Interest Income, Cash Basis Method	14	7
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	411		414
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	295		276
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	286	299
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	10	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	10	0
Impaired Financing Receivable, Related Allowance			0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance			0
Impaired Financing Receivable, with Related Allowance, Recorded Investment			0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		131
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		2
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		2
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	81		83
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	41		42
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	41	914
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	3	3
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	3	3
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	46		48
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	20		22
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	21	363
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	2
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	1	2
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	27		193
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	27		$ 133
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	62	200
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