Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Impaired Loans and Associated Reserves (Details) - USD ($)		Jun. 30, 2016		Dec. 31, 2015		Jun. 30, 2015
Real Estate Construction Portfolio Segment[Member] | Construction, 1-4 Family Residential [Member]
Principal Balance	[1]	$ 689,000		$ 718,000
Total Recorded Investment	[1],[2]	678,000		718,000
Impaired loans with no valuation allowance	[1],[2]	678,000		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]	696,000		713,000
Total Recorded Investment	[1],[2]	653,000		669,000
Impaired loans with no valuation allowance	[1],[2]	302,000		305,000
Impaired loans with a valuation allowance	[1],[2]	351,000		364,000
Related Allowance	[1]	12,000		13,000
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]
Principal Balance	[1]	207,000		218,000
Total Recorded Investment	[1],[2]	207,000		218,000
Impaired loans with no valuation allowance	[1],[2]	0		0
Impaired loans with a valuation allowance	[1],[2]	207,000		218,000
Related Allowance	[1]	4,000		5,000
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]
Principal Balance	[1]	74,000		75,000
Total Recorded Investment	[1],[2]	74,000		75,000
Impaired loans with no valuation allowance	[1],[2]	0		0
Impaired loans with a valuation allowance	[1],[2]	74,000		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 Recorded Investment	[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]	4,453,000		5,068,000
Total Recorded Investment	[1],[2]	4,406,000		5,020,000
Impaired loans with no valuation allowance	[1],[2]	3,240,000		3,304,000
Impaired loans with a valuation allowance	[1],[2]	1,166,000		1,716,000
Related Allowance	[1]	51,000		23,000
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Principal Balance	[1]	2,997,000		5,990,000
Total Recorded Investment	[1],[2]	2,773,000		5,827,000
Impaired loans with no valuation allowance	[1],[2]	2,773,000		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]	323,000		1,099,000
Total Recorded Investment	[1],[2]	315,000		1,091,000
Impaired loans with no valuation allowance	[1],[2]	315,000		1,091,000
Impaired loans with a valuation allowance	[1],[2]	0		0
Related Allowance	[1]	0		0
Principal Balance	[1]	11,306,000		15,869,000
Total Recorded Investment		10,700,000	[1],[2]	15,346,000	[1],[2]	$ 14,685,000
Impaired loans with no valuation allowance		8,902,000	[1],[2]	12,973,000	[1],[2]	12,182,000
Impaired loans with a valuation allowance		1,798,000	[1],[2]	2,373,000	[1],[2]	2,503,000
Related Allowance		$ 71,000	[1]	$ 45,000	[1]	$ 151,000

[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.