Note 7 - Fair Value of Financial Instruments (Details) - Quantitative Information about Level 3 Assets - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2016		Dec. 31, 2015
Income Approach Valuation Technique [Member] | Corporate Debt Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value (in Dollars)		$ 2,844		$ 2,834
Valuation technique		Discounted Cash Flows		Discounted Cash Flows
Unobservable input		Discount Rate		Discount Rate
Income Approach Valuation Technique [Member] | Collateralized Debt Obligations [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value (in Dollars)		$ 1,858		$ 1,883
Valuation technique		Discounted Cash Flows		Discounted Cash Flows
Unobservable input		Discount Rate		Discount Rate
Income Approach Valuation Technique [Member] | SBA Servicing Assets [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value (in Dollars)		$ 5,058		$ 4,886
Valuation technique		Discounted Cash Flows		Discounted Cash Flows
Unobservable input		Discount Rate		Discount Rate
December 31, 2015
Unobservable input		Conditional Prepayment Rate		Conditional Prepayment Rate
Market Approach Valuation Technique [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value (in Dollars)		$ 3,862		$ 5,734
Valuation technique	[1]	Appraised Value of Collateral (1)		Appraised Value of Collateral (1)
Unobservable input	[2]	Liquidation expenses (2)		Liquidation expenses (2)
December 31, 2015
Unobservable input	[2]	Appraisal adjustment (2)
Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value (in Dollars)		$ 8,185		$ 10,034
Valuation technique	[1]	Appraised Value of Collateral (1)		Appraised Value of Collateral (1)
Unobservable input	[2]	Liquidation expenses (2)		Liquidation expenses (2)
December 31, 2015
Unobservable input	[2]	Appraisal adjustment (2)		Appraisal adjustment (2)
Sales Price Valuation Technique [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation technique		Sales Price		Sales Price
Unobservable input	[2]	Liquidation expenses (2)		Liquidation expenses (2)
Minimum [Member] | Income Approach Valuation Technique [Member] | Collateralized Debt Obligations [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount Rate		7.38%		7.31%
Discount Rate, weighted average		(7.38%)		(7.31%)
Minimum [Member] | Market Approach Valuation Technique [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Liquidation expenses	[3]	12.00%		12.00%
Liquidation expenses, weighted average	[3]	(12.00%)		(12.00%)
Minimum [Member] | Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Liquidation expenses	[3]	7.00%		6.00%
Liquidation expenses, weighted average	[3]	(7.00%)		(6.00%)
Minimum [Member] | Sales Price Valuation Technique [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Liquidation expenses	[3]			7.00%
Liquidation expenses, weighted average	[3]			(7.00%)
Maximum [Member] | Income Approach Valuation Technique [Member] | Collateralized Debt Obligations [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount Rate		7.88%		7.81%
Discount Rate, weighted average		(7.88%)		(7.81%)
Maximum [Member] | Market Approach Valuation Technique [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Liquidation expenses	[3]	35.00%		78.00%
Liquidation expenses, weighted average	[3]	(35.00%)		(78.00%)
Maximum [Member] | Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Liquidation expenses	[3]	19.00%		30.00%
Liquidation expenses, weighted average	[3]	(19.00%)		(30.00%)
Maximum [Member] | Sales Price Valuation Technique [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Liquidation expenses	[3]			9.00%
Liquidation expenses, weighted average	[3]			(9.00%)
Weighted Average [Member] | Income Approach Valuation Technique [Member] | Corporate Debt Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount Rate		4.13%		4.11%
Discount Rate, weighted average		(4.13%)		(4.11%)
Weighted Average [Member] | Income Approach Valuation Technique [Member] | Collateralized Debt Obligations [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount Rate		7.61%		7.77%
Discount Rate, weighted average		(7.61%)		(7.77%)
Weighted Average [Member] | Income Approach Valuation Technique [Member] | SBA Servicing Assets [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount Rate		10.00%		10.00%
Discount Rate, weighted average		(10.00%)		(10.00%)
December 31, 2015
Conditional prepayment rate, weighted average		(6.28%)		(6.27%)
Weighted Average [Member] | Market Approach Valuation Technique [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Liquidation expenses	[3]	21.00%		20.00%
Liquidation expenses, weighted average	[3]	(21.00%)		(20.00%)
December 31, 2015
Appraisal adjustment, weighted average	[3]	(9.00%)
Weighted Average [Member] | Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Liquidation expenses	[3]	7.00%		10.00%
Liquidation expenses, weighted average	[3]	(7.00%)		(10.00%)
December 31, 2015
Appraisal adjustment, weighted average		(0.00%)	[3]	(50.00%)
Weighted Average [Member] | Sales Price Valuation Technique [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Liquidation expenses	[3]	6.00%		9.00%
Liquidation expenses, weighted average	[3]	(6.00%)		(9.00%)

[1] Fair value is generally determined through independent appraisals of the underlying collateral, which include Level 3 inputs that are not identifiable.

[2] Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses.

[3] The range and weighted average of qualitative factors such as economic conditions and estimated liquidation expenses are presented as a percent of the appraised value.