Note 8 - Fair Value Measurements (Details) - Level 3 Fair Value Measurements	6 Months Ended		12 Months Ended
	Jun. 30, 2013		Dec. 31, 2012
Discounted Appraised Value [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value, valuation technique	Discounted appraised value		Discounted appraised value
Fair value, unobservable input		[1]
Fair value, valuation technique	Discounted appraised value		Discounted appraised value
Fair value, valuation technique	Discounted appraised value		Discounted appraised value
Discounted Appraised Value [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value, valuation technique	Discounted appraised value		Discounted appraised value
Fair value, valuation technique	Discounted appraised value		Discounted appraised value
Fair value, valuation technique	Discounted appraised value		Discounted appraised value
Discounted Appraised Value [Member] | Minimum [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value, unobservable input			0.00%
Fair value, unobservable input			0.00%
Discounted Appraised Value [Member] | Minimum [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value, unobservable input		[2]		[2]
Fair value, unobservable input	0.00%		0.00%
Discounted Appraised Value [Member] | Maximum [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value, unobservable input			10.00%
Fair value, unobservable input			60.00%
Discounted Appraised Value [Member] | Maximum [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value, unobservable input	9.95%		6.00%
Fair value, unobservable input	3.65%		30.90%
Discounted Appraised Value [Member] | Weighted Average [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value, unobservable input			(2.00%)
Fair value, unobservable input			(52.00%)
Discounted Appraised Value [Member] | Weighted Average [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value, unobservable input	(2.66%)		(4.30%)
Fair value, unobservable input	(0.61%)		(4.68%)
Present Value of Cash Flows [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value, valuation technique	Present value of cash flows		Present value of cash flows
Fair value, valuation technique	Present value of cash flows		Present value of cash flows
Fair value, valuation technique	Present value of cash flows		Present value of cash flows
Present Value of Cash Flows [Member] | Minimum [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value, unobservable input	6.25%		6.00%
Present Value of Cash Flows [Member] | Maximum [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value, unobservable input	7.75%		7.50%
Present Value of Cash Flows [Member] | Weighted Average [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value, unobservable input	(6.63%)		(6.28%)

[1] Of the Company's impaired loans with specific allocations based on Level 3 inputs, only one loan was valued using fair value of collateral.

[2] 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.