Note 5 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Impaired Loans and Associated Reserves (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Principal Balance		$ 9,820	$ 15,869
Total Recorded Investment	[1]	9,173	15,346
Impaired loans with no valuation allowance	[1]	8,269	12,973
Impaired loans with a valuation allowance	[1]	904	2,373
Related Allowance		26	45
Real Estate Construction Portfolio Segment[Member] | Construction, 1-4 Family Residential [Member]
Principal Balance	[2]	280	718
Total Recorded Investment	[1],[2]	270	718
Impaired loans with no valuation allowance	[1],[2]	270	718
Impaired loans with a valuation allowance	[1],[2]	0	0
Related Allowance	[2]	0	0
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Principal Balance	[2]	648	713
Total Recorded Investment	[1],[2]	609	669
Impaired loans with no valuation allowance	[1],[2]	267	305
Impaired loans with a valuation allowance	[1],[2]	342	364
Related Allowance	[2]	14	13
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]
Principal Balance	[2]	195	218
Total Recorded Investment	[1],[2]	195	218
Impaired loans with no valuation allowance	[1],[2]	0	0
Impaired loans with a valuation allowance	[1],[2]	195	218
Related Allowance	[2]	7	5
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]
Principal Balance	[2]	73	75
Total Recorded Investment	[1],[2]	73	75
Impaired loans with no valuation allowance	[1],[2]	0	0
Impaired loans with a valuation allowance	[1],[2]	73	75
Related Allowance	[2]	4	4
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]
Principal Balance	[2]	1,364	1,988
Total Recorded Investment	[1],[2]	1,091	1,728
Impaired loans with no valuation allowance	[1],[2]	1,091	1,728
Impaired loans with a valuation allowance	[1],[2]	0	0
Related Allowance	[2]	0	0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Principal Balance	[2]	4,005	5,068
Total Recorded Investment	[1],[2]	3,957	5,020
Impaired loans with no valuation allowance	[1],[2]	3,663	3,304
Impaired loans with a valuation allowance	[1],[2]	294	1,716
Related Allowance	[2]	1	23
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Principal Balance	[2]	2,997	5,990
Total Recorded Investment	[1],[2]	2,734	5,827
Impaired loans with no valuation allowance	[1],[2]	2,734	5,827
Impaired loans with a valuation allowance	[1],[2]	0	0
Related Allowance	[2]	0	0
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Principal Balance	[2]	255	1,099
Total Recorded Investment	[1],[2]	241	1,091
Impaired loans with no valuation allowance	[1],[2]	241	1,091
Impaired loans with a valuation allowance	[1],[2]	0	0
Related Allowance	[2]	0	$ 0
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Principal Balance		3
Total Recorded Investment	[1]	3
Impaired loans with no valuation allowance	[1]	3
Impaired loans with a valuation allowance	[1]	0
Related Allowance		$ 0

[1] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.

[2] Only classes with impaired loans are shown.