Note 16 - Fair Value Measurements (Details) - Level 3 Fair Value Measurements	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Discounted Appraised Value [Member] | Impaired loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Selling cost range	10.00%	[1],[2]	0.00%	[1]
Selling cost weighted average	(10.00%)	[1],[2]	0.00%	[1]
Discounted Appraised Value [Member] | Impaired loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Selling cost range			10.00%	[1]
Selling cost weighted average			(10.00%)	[1]
Discounted Appraised Value [Member] | Impaired loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Selling cost range			5.00%	[1]
Selling cost weighted average			(5.00%)	[1]
Discounted Appraised Value [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation technique	Discounted appraised value		Discounted appraised value
Discounted rate range	Discounted appraised value		Discounted appraised value
Discounted Appraised Value [Member] | Other Real Estate Owned [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation technique	0%		0%
Selling cost range	0.00%	[1]	0.00%	[1]
Selling cost weighted average	0.00%	[1]	0.00%	[1]
Discounted rate range	0%		0%
Discounted Appraised Value [Member] | Other Real Estate Owned [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation technique	48.77%		29.60%
Selling cost range	11.00%		10.00%
Selling cost weighted average	(11.00%)		(10.00%)
Discounted rate range	48.77%		29.60%
Discounted Appraised Value [Member] | Other Real Estate Owned [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Selling cost range	8.60%		9.83%
Selling cost weighted average	(8.60%)		(9.83%)
Discounted rate weighted average	(20.81%)		(8.66%)
Discounted Appraised Value [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation technique	Discounted appraised value		Discounted appraised value
Discounted rate range	Discounted appraised value		Discounted appraised value
Present Value of Cash Flows [Member] | Impaired loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation technique	5.88%		6.25%
Discounted rate range	5.88%		6.25%
Present Value of Cash Flows [Member] | Impaired loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation technique	9.50%		9.50%
Discounted rate range	9.50%		9.50%
Present Value of Cash Flows [Member] | Impaired loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discounted rate weighted average	(6.15%)		(6.75%)
Present Value of Cash Flows [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation technique	Present value of cash flows		Present value of cash flows
Discounted rate range	Present value of cash flows		Present value of cash flows

[1] Impaired loans that are collateral-dependent are valued using the fair value of collateral. The valuation is discounted for selling costs if repayment of the loan is dependent on the sale of the collateral. If repayment will come from rental income of the property, the valuation is not discounted for selling costs.

[2] Only one loan was valued using the collateral method as of December 31, 2014.