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Note 8 - Loans - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Allowance for loan losses				$ 9,309				$ 8,856	$ 9,309	$ 8,856
Allowance for loan losses, charge-offs									(379)	(497)
Allowance for loan losses, recoveries									57	366
Allowance for loan losses, provision	$ 652	$ 1,158	$ (4)	(957)	$ 252	$ 60	$ (20)	292	849	584
Allowance for loan losses	9,836				9,309				9,836	9,309
Residential Portfolio Segment [Member]
Allowance for loan losses				3,986				3,963	3,986	3,963
Allowance for loan losses, charge-offs									(190)	(158)
Allowance for loan losses, recoveries									12	8
Allowance for loan losses, provision									374	173
Allowance for loan losses	4,182				3,986				4,182	3,986
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member]
Allowance for loan losses				3,156				3,200	3,156	3,200
Allowance for loan losses, charge-offs									(166)	(108)
Allowance for loan losses, recoveries									4	4
Allowance for loan losses, provision									411	60
Allowance for loan losses	3,405				3,156				3,405	3,156
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member]
Allowance for loan losses				325				224	325	224
Allowance for loan losses, charge-offs									(24)	0
Allowance for loan losses, recoveries									2	4
Allowance for loan losses, provision									81	97
Allowance for loan losses	384				325				384	325
Residential Portfolio Segment [Member] | Home Equity Line of Credit 1 [Member]
Allowance for loan losses				302				296	302	296
Allowance for loan losses, charge-offs									0	(50)
Allowance for loan losses, recoveries									5	0
Allowance for loan losses, provision									(31)	56
Allowance for loan losses	276				302				276	302
Residential Portfolio Segment [Member] | Construction Loans [Member]
Allowance for loan losses				203				243	203	243
Allowance for loan losses, charge-offs									0	0
Allowance for loan losses, recoveries									1	0
Allowance for loan losses, provision									(87)	(40)
Allowance for loan losses	117				203				117	203
Commercial Portfolio Segment [Member]
Allowance for loan losses				4,591				4,235	4,591	4,235
Allowance for loan losses, charge-offs									(6)	(165)
Allowance for loan losses, recoveries									6	317
Allowance for loan losses, provision									197	204
Allowance for loan losses	4,788				4,591				4,788	4,591
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Allowance for loan losses				2,538				2,584	2,538	2,584
Allowance for loan losses, charge-offs									0	(21)
Allowance for loan losses, recoveries									0	0
Allowance for loan losses, provision									(617)	(25)
Allowance for loan losses	1,921				2,538				1,921	2,538
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Allowance for loan losses				110				150	110	150
Allowance for loan losses, charge-offs									0	0
Allowance for loan losses, recoveries									0	0
Allowance for loan losses, provision									856	(40)
Allowance for loan losses	966				110				966	110
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Allowance for loan losses				1,553				1,065	1,553	1,065
Allowance for loan losses, charge-offs									(6)	(144)
Allowance for loan losses, recoveries									6	6
Allowance for loan losses, provision									(162)	626
Allowance for loan losses	1,391				1,553				1,391	1,553
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member]
Allowance for loan losses				102				105	102	105
Allowance for loan losses, charge-offs									0	0
Allowance for loan losses, recoveries									0	0
Allowance for loan losses, provision									56	(3)
Allowance for loan losses	158				102				158	102
Commercial Portfolio Segment [Member] | Multifamily 5 or More Residential [Member]
Allowance for loan losses				114				172	114	172
Allowance for loan losses, charge-offs									0	0
Allowance for loan losses, recoveries									0	311
Allowance for loan losses, provision									42	(369)
Allowance for loan losses	156				114				156	114
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Allowance for loan losses				46				57	46	57
Allowance for loan losses, charge-offs									0	0
Allowance for loan losses, recoveries									0	0
Allowance for loan losses, provision									(5)	(11)
Allowance for loan losses	41				46				41	46
Commercial Portfolio Segment [Member] | Other Commercial Loans [Member]
Allowance for loan losses				128				102	128	102
Allowance for loan losses, charge-offs									0	0
Allowance for loan losses, recoveries									0	0
Allowance for loan losses, provision									27	26
Allowance for loan losses	155				128				155	128
Consumer Portfolio Segment [Member]
Allowance for loan losses				233				159	233	159
Allowance for loan losses, charge-offs									(183)	(174)
Allowance for loan losses, recoveries									39	41
Allowance for loan losses, provision									192	207
Allowance for loan losses	281				233				281	233
Unallocated Financing Receivables [Member]
Allowance for loan losses				$ 499				$ 499	499	499
Allowance for loan losses, charge-offs									0	0
Allowance for loan losses, recoveries									0	0
Allowance for loan losses, provision									86	0
Allowance for loan losses	$ 585				$ 499				$ 585	$ 499

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- Definition

Amount of (credit) provision related to estimated loss from loan transactions.

+ References

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