Note 4 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Impaired Financing Receivable, Related Allowance	$ 34	$ 9
Impaired Financing Receivable, Unpaid Principal Balance	2,195	1,395
Impaired Financing Receivable, Recorded Investment, Total	1,923	1,189
Impaired Financing Receivable, Average Recorded Investment	1,274	1,783
Impaired Financing Receivable, Interest Income, Accrual Method	122	50
Impaired Financing Receivable, Interest Income, Cash Basis Method	122	50
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance
Impaired Financing Receivable, with No Related Allowance, Recorded Investment
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4	86
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method		6
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		6
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	176	173
Impaired Financing Receivable, with Related Allowance, Recorded Investment	179	174
Impaired Financing Receivable, Related Allowance	28	2
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	168	44
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	9	2
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	9	2
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	922	580
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	836	436
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	521	1,051
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	88	28
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	88	28
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	209	221
Impaired Financing Receivable, with Related Allowance, Recorded Investment	209	222
Impaired Financing Receivable, Related Allowance	6	7
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	217	226
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	13	14
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	13	14
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	604	124
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	463	93
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	117	97
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	12
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	12
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	284	297
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	236	264
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	247	279
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method