Note 4 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Impaired Financing Receivable, Related Allowance	$ 9		$ 9		$ 34
Impaired Financing Receivable, Unpaid Principal Balance	2,684		2,684		2,195
Impaired Financing Receivable, Recorded Investment	2,343		2,343		1,923
Impaired Financing Receivable, Average Recorded Investment	2,211	$ 887	2,091	$ 968
Impaired Financing Receivable, Interest Income, Accrual Method	13	6	25	105
Impaired Financing Receivable, Interest Income, Cash Basis Method	13	6	25	105
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,286		1,286		922
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,151		1,151		836
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	907	244	867	303
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	3	1	4	87
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	3	1	4	87
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance					209
Impaired Financing Receivable, with Related Allowance, Recorded Investment					209
Impaired Financing Receivable, Related Allowance					6
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	204	218	205	219
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	3	3	6	6
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	3	3	6	6
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	947		947		604
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	797		797		463
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	720	10	629	25
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	5		11	7
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	5		11	7
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	30		30
Impaired Financing Receivable, with Related Allowance, Recorded Investment	30		30
Impaired Financing Receivable, Related Allowance	6		6
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	10		5
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with 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	274		274		284
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	217		217		236
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	220	250	225	254
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method				5
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	147		147		176
Impaired Financing Receivable, with Related Allowance, Recorded Investment	148		148		179
Impaired Financing Receivable, Related Allowance	3		3		$ 28
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	150	165	160	167
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	2	2	4	$ 5
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	$ 2	$ 2	$ 4