Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Loans by Credit Quality Indicator (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Construction, 1-4 Family Residential [Member] | Pass [Member] | Real Estate Construction Portfolio Segment[Member]
Collectively evaluated for impairment	$ 12,768,000	$ 10,626,000
Construction, 1-4 Family Residential [Member] | Special Mention [Member] | Real Estate Construction Portfolio Segment[Member]
Collectively evaluated for impairment	3,694,000	3,694,000
Construction, 1-4 Family Residential [Member] | Classified Excluding Impaired [Member] | Real Estate Construction Portfolio Segment[Member]
Collectively evaluated for impairment	0	0
Construction Other [Member] | Pass [Member] | Real Estate Construction Portfolio Segment[Member]
Collectively evaluated for impairment	25,194,000	33,213,000
Construction Other [Member] | Special Mention [Member] | Real Estate Construction Portfolio Segment[Member]
Collectively evaluated for impairment	0	0
Construction Other [Member] | Classified Excluding Impaired [Member] | Real Estate Construction Portfolio Segment[Member]
Collectively evaluated for impairment	0	0
Equity Lines [Member] | Pass [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	16,544,000	16,236,000
Equity Lines [Member] | Special Mention [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment		15,000
Equity Lines [Member] | Classified Excluding Impaired [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	62,000	87,000
Closed End First Liens [Member] | Pass [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	80,103,000	78,614,000
Closed End First Liens [Member] | Special Mention [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	1,366,000	708,000
Closed End First Liens [Member] | Classified Excluding Impaired [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	998,000	1,370,000
Closed End Junior Liens [Member] | Pass [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	5,035,000	4,983,000
Closed End Junior Liens [Member] | Special Mention [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment		55,000
Closed End Junior Liens [Member] | Classified Excluding Impaired [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	57,000	61,000
Investor Owned Residential Real Estate [Member] | Pass [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	41,708,000	39,616,000
Investor Owned Residential Real Estate [Member] | Special Mention [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	29,000	31,000
Investor Owned Residential Real Estate [Member] | Classified Excluding Impaired [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	752,000	766,000
Multifamily Real Estate [Member] | Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	95,897,000	77,060,000
Multifamily Real Estate [Member] | Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	462,000	0
Multifamily Real Estate [Member] | Classified Excluding Impaired [Member] | Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	1,245,000	1,804,000
Commercial Real Estate, Owner Occupied [Member] | Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	115,472,000	121,741,000
Commercial Real Estate, Owner Occupied [Member] | Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	1,162,000	1,165,000
Commercial Real Estate, Owner Occupied [Member] | Classified Excluding Impaired [Member] | Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	929,000	1,274,000
Commercial Real Estate Other [Member] | Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	97,046,000	93,701,000
Commercial Real Estate Other [Member] | Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	57,000	58,000
Commercial Real Estate Other [Member] | Classified Excluding Impaired [Member] | Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	0	0
Commercial and Industrial [Member] | Pass [Member] | Commercial Non Real Estate Segment [Member]
Collectively evaluated for impairment	40,421,000	35,652,000
Commercial and Industrial [Member] | Special Mention [Member] | Commercial Non Real Estate Segment [Member]
Collectively evaluated for impairment	334,000	285,000
Commercial and Industrial [Member] | Classified Excluding Impaired [Member] | Commercial Non Real Estate Segment [Member]
Collectively evaluated for impairment	657,000	543,000
Credit Card Receivable [Member] | Pass [Member] | Consumer Non Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	5,929,000	5,773,000
Credit Card Receivable [Member] | Special Mention [Member] | Consumer Non Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	0	0
Credit Card Receivable [Member] | Classified Excluding Impaired [Member] | Consumer Non Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	0	0
Automobile Loan [Member] | Pass [Member] | Consumer Non Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	13,702,000	12,414,000
Automobile Loan [Member] | Special Mention [Member] | Consumer Non Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	82,000	102,000
Automobile Loan [Member] | Classified Excluding Impaired [Member] | Consumer Non Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	133,000	138,000
Other Consumer Loans [Member] | Pass [Member] | Consumer Non Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	12,142,000	11,359,000
Other Consumer Loans [Member] | Special Mention [Member] | Consumer Non Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	22,000	31,000
Other Consumer Loans [Member] | Classified Excluding Impaired [Member] | Consumer Non Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	17,000	28,000
Pass [Member] | States Political Subdivisions [Member]
Collectively evaluated for impairment	47,046,000	51,335,000
Pass [Member]
Collectively evaluated for impairment	609,007,000	592,323,000
Special Mention [Member] | States Political Subdivisions [Member]
Collectively evaluated for impairment	0	0
Special Mention [Member]
Collectively evaluated for impairment	7,208,000	6,144,000
Classified Excluding Impaired [Member] | States Political Subdivisions [Member]
Collectively evaluated for impairment	0	0
Classified Excluding Impaired [Member]
Collectively evaluated for impairment	4,850,000	6,071,000
Real Estate Construction Portfolio Segment[Member]
Collectively evaluated for impairment	41,656,000	47,533,000
Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	146,654,000	142,542,000
Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	312,270,000	296,803,000
Commercial Non Real Estate Segment [Member]
Collectively evaluated for impairment	41,412,000	36,480,000
Consumer Non Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	32,027,000	29,845,000
Collectively evaluated for impairment	$ 621,065,000	$ 604,538,000