Note 11 - Quantitative Information About Non-recurring Level 3 Fair Value of Financial Instruments and the Fair Value Measurements (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]
Range, capitalization rate	6.30%	7.30%
Range, loss severity discount	9.30%
Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]
Range, capitalization rate	7.70%	8.50%
Range, loss severity discount	15.00%
Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]
Range, capitalization rate	7.20%	7.70%
Range, loss severity discount	14.30%	15.00%
Impaired Loans [Member] | Income Approach Valuation Technique [Member]
Fair Value	$ 3,231,000	$ 3,878,000
Range, loss severity discount		15.00%
Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Minimum [Member]
Range, comparability adjustments	(50.00%)	(50.00%)
Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Maximum [Member]
Range, comparability adjustments	16.20%	40.00%
Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Weighted Average [Member]
Range, loss severity discount	15.00%	15.00%
Range, comparability adjustments	(3.90%)	(2.20%)
Impaired Loans [Member] | Sales Approach Valuation Technique [Member]
Fair Value	$ 4,433,000	$ 5,555,000
Range, loss severity discount	15.00%	15.00%
Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Minimum [Member]
Range, capitalization rate	5.60%	5.30%
Range, loss severity discount	6.90%	5.20%
Range, comparability adjustments	(50.00%)	(50.00%)
Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Maximum [Member]
Range, capitalization rate	9.00%	9.00%
Range, loss severity discount	15.00%	15.00%
Range, comparability adjustments	25.00%	25.00%
Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Weighted Average [Member]
Range, capitalization rate	7.30%	7.00%
Range, loss severity discount	13.90%	13.70%
Range, comparability adjustments	(2.50%)	(2.20%)
Impaired Loans [Member] | Blended Income and Sales Approach [Member]
Fair Value	$ 5,717,000	$ 5,927,000
Impaired Loans [Member]
Fair Value	$ 13,381,000	$ 15,360,000
Other Real Estate Owned [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]
Range, capitalization rate	9.00%	9.00%
Other Real Estate Owned [Member] | Income Approach Valuation Technique [Member]
Fair Value	$ 2,905,000	$ 3,750,000
Range, capitalization rate	9.00%	9.00%
Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member] | Minimum [Member]
Range, comparability adjustments	(5.00%)	(5.00%)
Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member] | Maximum [Member]
Range, comparability adjustments	25.00%	25.00%
Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member] | Weighted Average [Member]
Range, comparability adjustments	11.00%	12.00%
Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member]
Fair Value	$ 763,000	$ 366
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, capitalization rate		8.60%
Range, comparability adjustments		2.50%
Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member]
Fair Value		$ 816,000
Range, capitalization rate		8.60%
Other Real Estate Owned [Member]
Fair Value	3,668,000	$ 4,932,000
Fair Value	$ 17,049,000	$ 20,292,000