Note 4 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019
Impaired Financing Receivable, Related Allowance	$ 9		$ 9		$ 9
Impaired Financing Receivable, Unpaid Principal Balance	1,690		1,690		1,395
Impaired Financing Receivable, Recorded Investment, Total	1,524		1,524		1,189
Impaired Financing Receivable, Average Recorded Investment	1,304	$ 1,730	1,080	$ 1,884
Impaired Financing Receivable, Interest Income, Accrual Method	7	14	112	43
Impaired Financing Receivable, Interest Income, Cash Basis Method	7	14	112	43
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	21		21
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	21		21
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	14		5	100
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method				5
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method				5
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	155		155		173
Impaired Financing Receivable, with Related Allowance, Recorded Investment	156		156		174
Impaired Financing Receivable, Related Allowance	1		1		2
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	158	116	164
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	2	2	7
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	2	2	7
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	933		933		580
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	846		846		436
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	641	1,019	415	1,176
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	9	88	28
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	1	9	88	28
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	214		214		221
Impaired Financing Receivable, with Related Allowance, Recorded Investment	217		217		222
Impaired Financing Receivable, Related Allowance	8		8		7
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	216	224	218	227
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	4	3	10	10
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	4	3	10	10
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	79		79		124
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	42		42		93
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	31	96	27	98
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	288		288		297
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	242		242		$ 264
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	244	275	251	283
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method