Note 3 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018
Individually evaluated for impairment					$ 34	$ 48
Collectively evaluated for impairment					4,575	4,017
Allowance for loan losses	$ 4,609	$ 3,631	$ 4,609	$ 3,867	4,609	4,065
Beginning balance	4,339	3,631	4,065	3,634
Provision for loan losses	300	316	750	513
Charge-offs	(213)	(166)	(432)	(422)
Recoveries	183	86	226	142
Ending balance	4,609	3,867	4,609	3,867
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Individually evaluated for impairment					2	3
Collectively evaluated for impairment					752	690
Allowance for loan losses	754	301	754	688	754	693
Beginning balance	727	301	693	219
Provision for loan losses	4	398	75	538
Charge-offs	(92)	(15)	(130)	(75)
Recoveries	115	4	116	6
Ending balance	754	688	754	688
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Individually evaluated for impairment
Collectively evaluated for impairment					170	162
Allowance for loan losses	170	156	170	148	170	162
Beginning balance	164	156	162	133
Provision for loan losses	6	(8)	8	15
Charge-offs		0		0
Recoveries		0		0
Ending balance	170	148	170	148
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Individually evaluated for impairment
Collectively evaluated for impairment					316	224
Allowance for loan losses	316	291	316	216	316	224
Beginning balance	291	291	224	245
Provision for loan losses	25	(75)	92	(29)
Charge-offs		0		0
Recoveries		0		0
Ending balance	316	216	316	216
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Individually evaluated for impairment					32	44
Collectively evaluated for impairment					1,420	1,357
Allowance for loan losses	1,452	1,520	1,452	1,306	1,452	1,401
Beginning balance	1,391	1,520	1,401	1,622
Provision for loan losses	61	(237)	51	(348)
Charge-offs		0		0
Recoveries		23		32
Ending balance	1,452	1,306	1,452	1,306
Commercial Portfolio Segment [Member]
Individually evaluated for impairment						1
Collectively evaluated for impairment					596	458
Allowance for loan losses	596	276	596	417	596	459
Beginning balance	541	276	459	291
Provision for loan losses	55	141	137	126
Charge-offs		0		(1)
Recoveries		0		1
Ending balance	596	417	596	417
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Individually evaluated for impairment
Collectively evaluated for impairment					472	443
Allowance for loan losses	472	680	472	607	472	443
Beginning balance	450	680	443	710
Provision for loan losses	20	(75)	25	(109)
Charge-offs	(2)	(13)	(2)	(12)
Recoveries	4	15	6	18
Ending balance	472	607	472	607
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Individually evaluated for impairment
Collectively evaluated for impairment					849	683
Allowance for loan losses	849		849		849	683
Beginning balance			683
Ending balance	849		849
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Allowance for loan losses	775	407	849	485	$ 849	$ 683
Beginning balance	775	407	683	414
Provision for loan losses	129	172	362	320
Charge-offs	(119)	(138)	(300)	(334)
Recoveries	64	44	104	85
Ending balance	$ 849	$ 485	$ 849	$ 485

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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