Note 11 - Fair Value of Financial Instruments and Fair Value Measurements - Quantitative Information for Financial Instruments Measured at Fair Value (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Commercial Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Minimum [Member]
Fair value inputs, comparability adjustments		(31.77%)
Fair value inputs, management adjustments		0.00%
Commercial Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Maximum [Member]
Fair value inputs, comparability adjustments		34.00%
Fair value inputs, management adjustments		10.00%
Commercial Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member]
Fair value inputs, comparability adjustments		1.12%
Fair value inputs, management adjustments		5.00%
Commercial Portfolio Segment [Member] | Market Approach Valuation Technique [Member]
Assets measured at fair value		$ 28
Commercial Portfolio Segment [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]
Fair value inputs, cap rate		11.00%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Commercial Construction [Member] | Minimum [Member]
Fair value inputs, comparability adjustments	(5.00%)	(5.00%)
Fair value inputs, management adjustments	0.00%	0.00%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Commercial Construction [Member] | Maximum [Member]
Fair value inputs, comparability adjustments	99.00%	99.00%
Fair value inputs, management adjustments	10.00%	10.00%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Commercial Construction [Member] | Weighted Average [Member]
Fair value inputs, comparability adjustments	47.00%	47.00%
Fair value inputs, management adjustments	5.00%	5.00%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Commercial Construction [Member]
Assets measured at fair value	$ 51	$ 51
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Residential [Member] | Minimum [Member]
Fair value inputs, comparability adjustments	(22.00%)	(22.00%)
Fair value inputs, management adjustments	0.00%	0.00%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Residential [Member] | Maximum [Member]
Fair value inputs, comparability adjustments	0.00%	10.80%
Fair value inputs, management adjustments	40.00%	25.00%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Residential [Member] | Weighted Average [Member]
Fair value inputs, comparability adjustments	(11.00%)	5.60%
Fair value inputs, management adjustments	20.00%	12.50%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Residential [Member]
Assets measured at fair value	$ 416	$ 767
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Commercial [Member] | Minimum [Member]
Fair value inputs, comparability adjustments	(14.08%)	(31.77%)
Fair value inputs, management adjustments	0.00%	0.00%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Commercial [Member] | Maximum [Member]
Fair value inputs, comparability adjustments	24.62%	34.00%
Fair value inputs, management adjustments	100.00%	10.00%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Commercial [Member] | Weighted Average [Member]
Fair value inputs, comparability adjustments	5.27%	1.12%
Fair value inputs, management adjustments	50.00%	5.00%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Commercial [Member]
Assets measured at fair value	$ 5,846	$ 7,348
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Farmland [Member] | Minimum [Member]
Fair value inputs, comparability adjustments	(27.00%)	(27.00%)
Fair value inputs, management adjustments	10.00%	10.00%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Farmland [Member] | Maximum [Member]
Fair value inputs, comparability adjustments	15.00%	15.00%
Fair value inputs, management adjustments	75.00%	75.00%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Farmland [Member] | Weighted Average [Member]
Fair value inputs, comparability adjustments	(6.00%)	(6.00%)
Fair value inputs, management adjustments	42.50%	42.50%
Real Estate Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Farmland [Member]
Assets measured at fair value	$ 349	$ 351
Real Estate Portfolio Segment [Member] | Income Approach Valuation Technique [Member] | Commercial [Member] | Weighted Average [Member]
Fair value inputs, cap rate	10.67%	10.25%
Consumer and Other Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member] | Minimum [Member]
Fair value inputs, comparability adjustments	(50.80%)	(50.80%)
Fair value inputs, management adjustments	0.62%	15.53%
Consumer and Other Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member] | Maximum [Member]
Fair value inputs, comparability adjustments	142.90%	142.90%
Fair value inputs, management adjustments	72.75%	72.75%
Consumer and Other Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member] | Weighted Average [Member]
Fair value inputs, comparability adjustments	46.05%	46.05%
Fair value inputs, management adjustments	29.23%	43.37%
Consumer and Other Portfolio Segment [Member] | Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member]
Assets measured at fair value	$ 2,850	$ 2,536
Consumer and Other Portfolio Segment [Member] | Income Approach Valuation Technique [Member] | Other Real Estate Owned [Member] | Weighted Average [Member]
Fair value inputs, discount rate	12.50%	12.50%