Note 3 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Impaired Financing Receivable, Related Allowance	$ 30		$ 30		$ 44
Impaired Financing Receivable, Unpaid Principal Balance	1,762		1,762		3,161
Impaired Financing Receivable, Recorded Investment	1,765		1,765		2,234
Impaired Financing Receivable, Average Recorded Investment	1,887	$ 2,673	1,913	$ 4,089
Impaired Financing Receivable, Interest Income, Accrual Method	12	8	24	209
Impaired Financing Receivable, Interest Income, Cash Basis Method	12	8	24	209
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	122		122		482
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	122		122		444
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment			117	330
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method			3	80
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method			3	80
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance
Impaired Financing Receivable, with Related Allowance, Recorded Investment
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	120	14		7
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	1
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		10		170
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
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	973		973		1,928
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	976		976		1,039
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,061	607	1,057	1,081
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	6		16	105
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	6		16	105
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	327		327		548
Impaired Financing Receivable, with Related Allowance, Recorded Investment	327		327		548
Impaired Financing Receivable, Related Allowance	30		30		42
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	330	1,612	337	2,030
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	5	7	5	15
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	5	7	5	15
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	25		25		104
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	25		25		103
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	318	127	80	127
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		101		139
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		1		3
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		1		3
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	315		315
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	315		315
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	58	202	322	205
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method