Note 4 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019
Impaired Financing Receivable, Related Allowance	$ 9		$ 9
Impaired Financing Receivable, Unpaid Principal Balance	1,036		1,395
Impaired Financing Receivable, Recorded Investment, Total	896		1,189
Impaired Financing Receivable, Average Recorded Investment	1,048	$ 2,062
Impaired Financing Receivable, Interest Income, Accrual Method	99	15
Impaired Financing Receivable, Interest Income, Cash Basis Method	99	15
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	167
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	169
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	170	71
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	3	1
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	3	1
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		2
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	316		580
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	240		436
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	362	1,369
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	86	11
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	86	11
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	218		221
Impaired Financing Receivable, with Related Allowance, Recorded Investment	220		222
Impaired Financing Receivable, Related Allowance	7		7
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	220	231
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	3	3
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	3	3
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	43		124
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	12		93
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	39	99
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	7
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	7
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	292		297
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	255		$ 264
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	257	292
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method