Note 3 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Impaired Financing Receivable, Related Allowance	$ 7		$ 7		$ 29
Impaired Financing Receivable, Unpaid Principal Balance	2,108		2,108		2,059
Impaired Financing Receivable, Recorded Investment	1,870		1,870		2,060
Impaired Financing Receivable, Average Recorded Investment	1,860	$ 1,887	1,961	$ 1,913
Impaired Financing Receivable, Interest Income, Accrual Method	14	12	29	24
Impaired Financing Receivable, Interest Income, Cash Basis Method	14	12	29	24
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	112		112		100
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	114		114		100
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	113	120	92	117
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	2	1	3	3
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	2	1	3	3
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,340		1,340		1,330
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,153		1,153		1,330
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,140	1,061	1,255	1,057
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	8	6	19	16
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	8	6	19	16
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	225		225		231
Impaired Financing Receivable, with Related Allowance, Recorded Investment	226		226		232
Impaired Financing Receivable, Related Allowance	7		7		29
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	227	330	229	337
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	4	5	7	5
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	4	5	7	5
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	127		127		101
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	97		97		101
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	97	318	98	80
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	304		304		297
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	280		280		$ 297
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	283	58	287	322
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method