Note 8 - Fair Value Measurements (Details) - Level 3 Fair Value Measurements	3 Months Ended		12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Present Value of Cash Flows [Member] | Impaired loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	5.88%		5.88%
Discount rate weighted average	(5.88%)		(5.88%)
Present Value of Cash Flows [Member] | Impaired loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	9.50%		9.50%
Discount rate weighted average	(9.50%)		(9.50%)
Present Value of Cash Flows [Member] | Impaired loans [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	6.11%		6.15%
Discount rate weighted average	(6.11%)		(6.15%)
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 Appraised Value [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Valuation Technique	Discounted appraised value		Discounted appraised value
Selling cost	10.00%		10.00%
Selling cost weighted average	(10.00%)		(10.00%)
Discounted Appraised Value [Member] | Other Real Estate Owned [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	3.76%		0.00%
Discount rate weighted average	(3.76%)		0.00%
Selling cost	0.00%	[1]	0.00%	[1]
Selling cost weighted average	0.00%	[1]	0.00%	[1]
Discounted Appraised Value [Member] | Other Real Estate Owned [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	48.77%		48.77%
Discount rate weighted average	(48.77%)		(48.77%)
Selling cost	11.00%		11.00%
Selling cost weighted average	(11.00%)		(11.00%)
Discounted Appraised Value [Member] | Other Real Estate Owned [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	14.64%		20.81%
Discount rate weighted average	(14.64%)		(20.81%)
Selling cost	9.13%		8.60%
Selling cost weighted average	(9.13%)		(8.60%)
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

[1] The Company markets other real estate owned both independently and with local realtors. Properties marketed by realtors are discounted by selling costs. Properties that the Company markets independently are not discounted by selling costs.