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Note 4 - Loans - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018
Beginning balance	$ 3,788	$ 3,422
Provision for loan losses	130	115
Loans charged-off	(16)	(7)
Recoveries	7	8
Individually evaluated for impairment			$ 9	$ 9
Collectively evaluated for impairment			3,900	3,779
Total ending allowance balance	3,788	3,422	3,909	3,788	$ 3,538
Loans individually evaluated for impairment			893	1,189
Loans collectively evaluated for impairment			383,691	368,877
Total ending loans balance			384,584	370,066
Commercial Portfolio Segment [Member]
Beginning balance	660	586
Provision for loan losses	(11)	16
Loans charged-off
Recoveries
Individually evaluated for impairment			2	2
Collectively evaluated for impairment			647	658
Total ending allowance balance	660	586	649	660	602
Loans individually evaluated for impairment			167	174
Loans collectively evaluated for impairment			81,639	80,413
Total ending loans balance			81,806	80,587
Commercial Real Estate Portfolio Segment [Member]
Beginning balance	2,575	2,277
Provision for loan losses	69	100
Loans charged-off
Recoveries	1	1
Individually evaluated for impairment			7	7
Collectively evaluated for impairment			2,638	2,568
Total ending allowance balance	2,575	2,277	2,645	2,575	2,378
Loans individually evaluated for impairment			460	658
Loans collectively evaluated for impairment			219,298	210,709
Total ending loans balance			219,758	211,367
Residential Portfolio Segment [Member]
Beginning balance	494	499
Provision for loan losses	56	5
Loans charged-off
Recoveries		3
Individually evaluated for impairment
Collectively evaluated for impairment			550	494
Total ending allowance balance	494	499	550	494	507
Loans individually evaluated for impairment			266	357
Loans collectively evaluated for impairment			76,822	72,591
Total ending loans balance			77,088	72,948
Consumer Portfolio Segment [Member]
Beginning balance	59	60
Provision for loan losses	16	(6)
Loans charged-off	(16)	(7)
Recoveries	6	4
Individually evaluated for impairment
Collectively evaluated for impairment			65	59
Total ending allowance balance	$ 59	$ 60	65	59	$ 51
Loans individually evaluated for impairment
Loans collectively evaluated for impairment			5,932	5,164
Total ending loans balance			$ 5,932	$ 5,164