Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Impaired Loans and Associated Reserves (Details) - USD ($)		Mar. 31, 2016		Dec. 31, 2015		Mar. 31, 2015
Real Estate Construction Portfolio Segment[Member] | Construction, 1-4 Family Residential [Member]
Principal Balance	[1]	$ 689,000		$ 718,000
Total impaired loans	[1],[2]	682,000		718,000
Impaired loans with no valuation allowance	[1],[2]	682,000		718,000
Impaired loans with a valuation allowance	[1],[2]	0		0
Related Allowance	[1]	0		0
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Principal Balance	[1]	708,000		713,000
Total impaired loans	[1],[2]	664,000		669,000
Impaired loans with no valuation allowance	[1],[2]	303,000		305,000
Impaired loans with a valuation allowance	[1],[2]	361,000		364,000
Related Allowance	[1]	13,000		13,000
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]
Principal Balance	[1]	214,000		218,000
Total impaired loans	[1],[2]	214,000		218,000
Impaired loans with no valuation allowance	[1],[2]	0		0
Impaired loans with a valuation allowance	[1],[2]	214,000		218,000
Related Allowance	[1]	5,000		5,000
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]
Principal Balance	[1]	75,000		75,000
Total impaired loans	[1],[2]	75,000		75,000
Impaired loans with no valuation allowance	[1],[2]	0		0
Impaired loans with a valuation allowance	[1],[2]	75,000		75,000
Related Allowance	[1]	4,000		4,000
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]
Principal Balance	[1]	1,867,000		1,988,000
Total impaired loans	[1],[2]	1,594,000		1,728,000
Impaired loans with no valuation allowance	[1],[2]	1,594,000		1,728,000
Impaired loans with a valuation allowance	[1],[2]	0		0
Related Allowance	[1]	0		0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Principal Balance	[1]	4,213,000		5,068,000
Total impaired loans	[1],[2]	4,165,000		5,020,000
Impaired loans with no valuation allowance	[1],[2]	2,997,000		3,304,000
Impaired loans with a valuation allowance	[1],[2]	1,168,000		1,716,000
Related Allowance	[1]	58,000		23,000
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Principal Balance	[1]	5,966,000		5,990,000
Total impaired loans	[1],[2]	5,778,000		5,827,000
Impaired loans with no valuation allowance	[1],[2]	5,778,000		5,827,000
Impaired loans with a valuation allowance	[1],[2]	0		0
Related Allowance	[1]	0		0
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Principal Balance	[1]	824,000		1,099,000
Total impaired loans	[1],[2]	817,000		1,091,000
Impaired loans with no valuation allowance	[1],[2]	817,000		1,091,000
Impaired loans with a valuation allowance	[1],[2]	0		0
Related Allowance	[1]	0		0
Principal Balance	[1]	14,556,000		15,869,000
Total impaired loans		13,989,000	[1],[2]	15,346,000	[1],[2]	$ 14,994,000
Impaired loans with no valuation allowance		12,171,000	[1],[2]	12,973,000	[1],[2]	11,265,000
Impaired loans with a valuation allowance		1,818,000	[1],[2]	2,373,000	[1],[2]	3,729,000
Related Allowance		$ 80,000	[1]	$ 45,000	[1]	$ 236,000

[1] Only classes with impaired loans are shown.

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