Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Loans by Credit Quality Indicator (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Construction, 1-4 Family Residential [Member] | Pass [Member] | Real Estate Construction Portfolio Segment[Member]
Collectively evaluated for impairment	$ 11,709,000	$ 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	23,108,000	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	16,468,000	16,236,000
Equity Lines [Member] | Special Mention [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	33,000	15,000
Equity Lines [Member] | Classified Excluding Impaired [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	95,000	87,000
Closed End First Liens [Member] | Pass [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	76,645,000	78,614,000
Closed End First Liens [Member] | Special Mention [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	728,000	708,000
Closed End First Liens [Member] | Classified Excluding Impaired [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	1,729,000	1,370,000
Closed End Junior Liens [Member] | Pass [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	5,041,000	4,983,000
Closed End Junior Liens [Member] | Special Mention [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	23,000	55,000
Closed End Junior Liens [Member] | Classified Excluding Impaired [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	130,000	61,000
Investor Owned Residential Real Estate [Member] | Pass [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	41,635,000	39,616,000
Investor Owned Residential Real Estate [Member] | Special Mention [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	30,000	31,000
Investor Owned Residential Real Estate [Member] | Classified Excluding Impaired [Member] | Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	758,000	766,000
Multifamily Real Estate [Member] | Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	81,296,000	77,060,000
Multifamily Real Estate [Member] | Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	0	0
Multifamily Real Estate [Member] | Classified Excluding Impaired [Member] | Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	1,791,000	1,804,000
Commercial Real Estate, Owner Occupied [Member] | Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	119,319,000	121,741,000
Commercial Real Estate, Owner Occupied [Member] | Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	1,163,000	1,165,000
Commercial Real Estate, Owner Occupied [Member] | Classified Excluding Impaired [Member] | Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	1,227,000	1,274,000
Commercial Real Estate Other [Member] | Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	94,247,000	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	32,400,000	35,652,000
Commercial and Industrial [Member] | Special Mention [Member] | Commercial Non Real Estate Segment [Member]
Collectively evaluated for impairment	234,000	285,000
Commercial and Industrial [Member] | Classified Excluding Impaired [Member] | Commercial Non Real Estate Segment [Member]
Collectively evaluated for impairment	231,000	543,000
Credit Card Receivable [Member] | Pass [Member] | Consumer Non Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	5,808,000	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	12,509,000	12,414,000
Automobile Loan [Member] | Special Mention [Member] | Consumer Non Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	75,000	102,000
Automobile Loan [Member] | Classified Excluding Impaired [Member] | Consumer Non Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	188,000	138,000
Other Consumer Loans [Member] | Pass [Member] | Consumer Non Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	11,241,000	11,359,000
Other Consumer Loans [Member] | Special Mention [Member] | Consumer Non Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	82,000	31,000
Other Consumer Loans [Member] | Classified Excluding Impaired [Member] | Consumer Non Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	30,000	28,000
Pass [Member] | States Political Subdivisions [Member]
Collectively evaluated for impairment	50,777,000	51,335,000
Pass [Member]
Collectively evaluated for impairment	582,203,000	592,323,000
Special Mention [Member] | States Political Subdivisions [Member]
Collectively evaluated for impairment	0	0
Special Mention [Member]
Collectively evaluated for impairment	6,119,000	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	6,179,000	6,071,000
Real Estate Construction Portfolio Segment[Member]
Collectively evaluated for impairment	38,511,000	47,533,000
Consumer Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	143,315,000	142,542,000
Commercial Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	299,100,000	296,803,000
Commercial Non Real Estate Segment [Member]
Collectively evaluated for impairment	32,865,000	36,480,000
Consumer Non Real Estate Portfolio Segment [Member]
Collectively evaluated for impairment	29,933,000	29,845,000
Collectively evaluated for impairment	$ 594,501,000	$ 604,538,000