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Note 3 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Dec. 31, 2019
Individually evaluated for impairment			$ 15	$ 16
Collectively evaluated for impairment			5,269	5,033
Allowance for loan losses	$ 5,061	$ 4,339	5,307	5,061
Beginning balance	5,061	4,065
Provision for loan losses	351	450
Charge-offs	(159)	(220)
Recoveries	54	44
Ending balance	5,307	4,339
Financial Asset Acquired with Credit Deterioration [Member]
Allowance for loan losses	12		23	12
Beginning balance	12
Ending balance	23
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Individually evaluated for impairment			15	16
Collectively evaluated for impairment			891	839
Allowance for loan losses	867	727	929	867
Beginning balance	867	693
Provision for loan losses	62	71
Charge-offs		(39)
Recoveries		2
Ending balance	929	727
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Allowance for loan losses	12		23	12
Beginning balance	12
Ending balance	23
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Individually evaluated for impairment
Collectively evaluated for impairment			163	163
Allowance for loan losses	163	164	163	163
Beginning balance	163	162
Provision for loan losses		2
Charge-offs
Recoveries
Ending balance	163	164
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Allowance for loan losses
Ending balance
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Individually evaluated for impairment
Collectively evaluated for impairment			353	350
Allowance for loan losses	350	291	353	350
Beginning balance	350	224
Provision for loan losses	3	67
Charge-offs
Recoveries
Ending balance	353	291
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Allowance for loan losses
Ending balance
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Individually evaluated for impairment
Collectively evaluated for impairment			1,735	1,623
Allowance for loan losses	1,623	1,391	1,735	1,623
Beginning balance	1,623	1,401
Provision for loan losses	112	(10)
Charge-offs
Recoveries
Ending balance	1,735	1,391
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Allowance for loan losses
Ending balance
Commercial Portfolio Segment [Member]
Individually evaluated for impairment
Collectively evaluated for impairment			620	595
Allowance for loan losses	595	541	620	595
Beginning balance	595	459
Provision for loan losses	25	82
Charge-offs
Recoveries
Ending balance	620	541
Commercial Portfolio Segment [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Allowance for loan losses
Ending balance
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Individually evaluated for impairment
Collectively evaluated for impairment			550	515
Allowance for loan losses	515	450	550	515
Beginning balance	515	443
Provision for loan losses	33	5
Charge-offs
Recoveries	2	2
Ending balance	550	450
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Allowance for loan losses
Ending balance
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Allowance for loan losses	957	775	957	948
Beginning balance	948	683
Provision for loan losses	116	233
Charge-offs	(159)	(181)
Recoveries	52	40
Ending balance	957	$ 775
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Individually evaluated for impairment
Collectively evaluated for impairment			957	948
Allowance for loan losses	948		957	$ 948
Beginning balance	948
Ending balance	957
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Allowance for loan losses
Ending balance