Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Impaired Loans and Associated Reserves (Details) - USD ($) $ in Thousands		Jun. 30, 2017		Dec. 31, 2016		Jun. 30, 2016
Principal Balance		$ 10,573		$ 9,820
Total Recorded Investment		10,200	[1]	9,173	[1]	$ 10,700
Impaired loans with no valuation allowance		9,320	[1]	8,269	[1]	8,902
Impaired loans with a valuation allowance		880	[1]	904	[1]	1,798
Related Allowance		23		26		$ 71
Real Estate Construction Portfolio Segment[Member] | Construction, Other [Member]
Principal Balance	[2]	3,300
Total Recorded Investment	[1],[2]	3,300
Impaired loans with no valuation allowance	[1],[2]	3,300
Impaired loans with a valuation allowance	[1],[2]	0
Related Allowance	[2]	0
Real Estate Construction Portfolio Segment[Member] | Construction, 1-4 Family Residential [Member]
Principal Balance	[2]			280
Total Recorded Investment	[1],[2]			270
Impaired loans with no valuation allowance	[1],[2]			270
Impaired loans with a valuation allowance	[1],[2]			0
Related Allowance	[2]			0
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Principal Balance	[2]	635		648
Total Recorded Investment	[1],[2]	596		609
Impaired loans with no valuation allowance	[1],[2]	264		267
Impaired loans with a valuation allowance	[1],[2]	332		342
Related Allowance	[2]	12		14
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]
Principal Balance	[2]	184		195
Total Recorded Investment	[1],[2]	184		195
Impaired loans with no valuation allowance	[1],[2]	0		0
Impaired loans with a valuation allowance	[1],[2]	184		195
Related Allowance	[2]	6		7
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]
Principal Balance	[2]	351		73
Total Recorded Investment	[1],[2]	335		73
Impaired loans with no valuation allowance	[1],[2]	263		0
Impaired loans with a valuation allowance	[1],[2]	72		73
Related Allowance	[2]	4		4
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Principal Balance	[2]	2,996		4,005
Total Recorded Investment	[1],[2]	2,991		3,957
Impaired loans with no valuation allowance	[1],[2]	2,699		3,663
Impaired loans with a valuation allowance	[1],[2]	292		294
Related Allowance	[2]	1		1
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]
Principal Balance	[2]			1,364
Total Recorded Investment	[1],[2]			1,091
Impaired loans with no valuation allowance	[1],[2]			1,091
Impaired loans with a valuation allowance	[1],[2]			0
Related Allowance	[2]			0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Principal Balance	[2]	2,952		2,997
Total Recorded Investment	[1],[2]	2,655		2,734
Impaired loans with no valuation allowance	[1],[2]	2,655		2,734
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]	153		255
Total Recorded Investment	[1],[2]	137		241
Impaired loans with no valuation allowance	[1],[2]	137		241
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	[2]	2		3
Total Recorded Investment	[1],[2]	2		3
Impaired loans with no valuation allowance	[1],[2]	2		3
Impaired loans with a valuation allowance	[1],[2]	0		0
Related Allowance	[2]	$ 0		$ 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.