Note 18 - Fair Value of Financial Instruments - Quantitative Information About Non-recurring Level 3 Fair Value of Financial Instruments and the Fair Value Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value	$ 15,501	$ 20,292
Impaired Loans [Member]
Fair Value	14,968	15,360
Impaired Loans [Member] | Income Approach Valuation Technique [Member]
Fair Value	$ 2,007	$ 3,878
Range, loss severity discount	15.00%	15.00%
Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]
Range, capitalization rate	6.00%	7.30%
Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]
Range, capitalization rate	7.50%	8.50%
Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]
Range, capitalization rate	7.00%	7.70%
Range, loss severity discount	15.00%	15.00%
Impaired Loans [Member] | Sales Approach Valuation Technique [Member]
Fair Value	$ 8,703	$ 5,555
Range, loss severity discount		15.00%
Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Minimum [Member]
Range, loss severity discount	0.00%
Range, comparability adjustments	(40.00%)	(50.00%)
Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Maximum [Member]
Range, loss severity discount	15.00%
Range, comparability adjustments	16.20%	40.00%
Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Weighted Average [Member]
Range, loss severity discount	7.70%	15.00%
Range, comparability adjustments	(1.50%)	(2.20%)
Impaired Loans [Member] | Blended Income and Sales Approach [Member]
Fair Value	$ 4,258	$ 5,927
Range, loss severity discount	15.00%
Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Minimum [Member]
Range, capitalization rate	5.30%	5.30%
Range, loss severity discount		5.20%
Range, comparability adjustments	(50.00%)	(50.00%)
Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Maximum [Member]
Range, capitalization rate	9.50%	9.00%
Range, loss severity discount		15.00%
Range, comparability adjustments	25.00%	25.00%
Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Weighted Average [Member]
Range, capitalization rate	7.20%	7.00%
Range, loss severity discount	15.00%	13.70%
Range, comparability adjustments	(0.60%)	(2.20%)
Other Real Estate Owned [Member]
Fair Value	$ 533	$ 4,932
Other Real Estate Owned [Member] | Income Approach Valuation Technique [Member]
Fair Value		$ 3,750
Range, capitalization rate		9.00%
Other Real Estate Owned [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]
Range, capitalization rate		9.00%
Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member]
Fair Value	$ 533	$ 366
Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member] | Minimum [Member]
Range, comparability adjustments	3.30%	(5.00%)
Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member] | Maximum [Member]
Range, capitalization rate	18.60%
Range, comparability adjustments		25.00%
Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member] | Weighted Average [Member]
Range, capitalization rate	11.00%
Range, comparability adjustments		12.00%
Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member]
Fair Value		$ 816
Range, loss severity discount		8.60%
Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member] | Minimum [Member]
Range, comparability adjustments		(10.00%)
Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member] | Maximum [Member]
Range, comparability adjustments		15.00%
Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member] | Weighted Average [Member]
Range, loss severity discount		8.60%
Range, comparability adjustments		2.50%