Note 3 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Dec. 31, 2018
Individually evaluated for impairment			$ 68	$ 48
Collectively evaluated for impairment			4,271	4,017
Allowance for loan losses	$ 4,339	$ 3,634	4,339	4,065
Beginning balance	4,065	3,634
Provision for loan losses	450	197
Charge-offs	(220)	(257)
Recoveries	44	57
Ending balance	4,339	3,631
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Individually evaluated for impairment			28	3
Collectively evaluated for impairment			699	690
Allowance for loan losses	727	219	727	693
Beginning balance	693	219
Provision for loan losses	71	139
Charge-offs	(39)	(60)
Recoveries	2	3
Ending balance	727	301
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Individually evaluated for impairment
Collectively evaluated for impairment			164	162
Allowance for loan losses	164	133	164	162
Beginning balance	162	133
Provision for loan losses	2	23
Charge-offs
Recoveries
Ending balance	164	156
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Individually evaluated for impairment
Collectively evaluated for impairment			291	224
Allowance for loan losses	291	245	291	224
Beginning balance	224	245
Provision for loan losses	67	46
Charge-offs
Recoveries
Ending balance	291	291
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Individually evaluated for impairment			39	44
Collectively evaluated for impairment			1,352	1,357
Allowance for loan losses	1,391	1,622	1,391	1,401
Beginning balance	1,401	1,622
Provision for loan losses	(10)	(110)
Charge-offs
Recoveries		8
Ending balance	1,391	1,520
Commercial Portfolio Segment [Member]
Individually evaluated for impairment			1	1
Collectively evaluated for impairment			540	458
Allowance for loan losses	541	291	541	459
Beginning balance	459	291
Provision for loan losses	82	(15)
Charge-offs		(1)
Recoveries		1
Ending balance	541	276
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Individually evaluated for impairment
Collectively evaluated for impairment			450	443
Allowance for loan losses	450	710	450	443
Beginning balance	443	710
Provision for loan losses	5	(33)
Charge-offs
Recoveries	2	3
Ending balance	450	680
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Individually evaluated for impairment
Collectively evaluated for impairment			775	683
Allowance for loan losses	775		775	683
Beginning balance	683
Ending balance	775
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Allowance for loan losses	683	414	$ 775	$ 683
Beginning balance	683	414
Provision for loan losses	233	147
Charge-offs	(181)	(196)
Recoveries	40	42
Ending balance	$ 775	$ 407

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

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