Note 3 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2016
Impaired Financing Receivable, Related Allowance	$ 33		$ 44
Impaired Financing Receivable, Unpaid Principal Balance	2,009		3,161
Impaired Financing Receivable, Recorded Investment	2,012		2,234
Impaired Financing Receivable, Average Recorded Investment	1,939	$ 5,505
Impaired Financing Receivable, Interest Income, Accrual Method	12	201
Impaired Financing Receivable, Interest Income, Cash Basis Method	12	201
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	124		482
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	125		444
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	114	660
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	2	80
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	2	80
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,121		1,928
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,123		1,039
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,053	1,555
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	10	105
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	10	105
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	338		548
Impaired Financing Receivable, with Related Allowance, Recorded Investment	339		548
Impaired Financing Receivable, Related Allowance	33		42
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	343	2,449
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		8
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		8
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		329
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	102		104
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	101		103
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	102	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		177
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method		2
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		2
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	324
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	324
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	327	208
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method