Note 3 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Impaired Financing Receivable, Related Allowance	$ 29	$ 44
Impaired Financing Receivable, Unpaid Principal Balance	2,059	3,161
Impaired Financing Receivable, Recorded Investment, Total	2,060	2,234
Impaired Financing Receivable, Average Recorded Investment	1,883	3,551
Impaired Financing Receivable, Interest Income, Accrual Method	50	218
Impaired Financing Receivable, Interest Income, Cash Basis Method	50	218
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	100	482
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	100	444
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	111	207
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	5	80
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	5	80
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,330	1,928
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,330	1,039
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,102	951
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	17	105
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	17	105
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	231	548
Impaired Financing Receivable, with Related Allowance, Recorded Investment	232	548
Impaired Financing Receivable, Related Allowance	29	42
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	285	1,884
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	28	21
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	28	21
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [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		87
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
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	101	104
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	101	103
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	71	119
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		99
Impaired Financing Receivable, with Related Allowance, Recorded Investment		100
Impaired Financing Receivable, Related Allowance		2
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		120
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		6
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		6
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	297
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	297
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	314	183
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method