Note 3 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Impaired Financing Receivable, Related Allowance	$ 7		$ 7		$ 29
Impaired Financing Receivable, Unpaid Principal Balance	2,077		2,077		2,059
Impaired Financing Receivable, Recorded Investment	1,799		1,799		2,060
Impaired Financing Receivable, Average Recorded Investment	1,730	$ 1,819	1,884	$ 1,882
Impaired Financing Receivable, Interest Income, Accrual Method	14	13	43	37
Impaired Financing Receivable, Interest Income, Cash Basis Method	14	13	43	37
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	112		112		100
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	116	122	100	119
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	2	2	5	5
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	2	2	5	5
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,315		1,315		1,330
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,097		1,097		1,330
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,019	1,131	1,176	1,082
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	9	8	28	24
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	9	8	28	24
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	222		222		231
Impaired Financing Receivable, with Related Allowance, Recorded Investment	223		223		232
Impaired Financing Receivable, Related Allowance	7		7		29
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	224	234	227	302
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	3	3	10	8
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	3	3	10	8
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	126		126		101
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	95		95		101
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	96	23	98	61
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	302		302		297
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	272		272		$ 297
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	275	309	283	318
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method