Note 4 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Impaired Financing Receivable, Related Allowance	$ 9	$ 29
Impaired Financing Receivable, Unpaid Principal Balance	1,395	2,059
Impaired Financing Receivable, Recorded Investment, Total	1,189	2,060
Impaired Financing Receivable, Average Recorded Investment	1,783	1,883
Impaired Financing Receivable, Interest Income, Accrual Method	50	50
Impaired Financing Receivable, Interest Income, Cash Basis Method	50	50
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		100
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		100
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	86	111
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	6	5
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	6	5
Commercial Real Estate Portfolio Segment [Member]
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	173
Impaired Financing Receivable, with Related Allowance, Recorded Investment	174
Impaired Financing Receivable, Related Allowance	2
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	44
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	580	1,330
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	436	1,330
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,051	1,102
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	28	17
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	28	17
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	221	231
Impaired Financing Receivable, with Related Allowance, Recorded Investment	222	232
Impaired Financing Receivable, Related Allowance	7	29
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	226	285
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	14	28
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	14	28
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	124	101
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	93	101
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	97	71
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with No 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	297	297
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	264	297
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	279	314
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method