Note 9 - Fair Value Measurements and Disclosures (Details) - Quantitative Information about Assets Measured at Fair Value - USD ($) $ in Thousands		9 Months Ended		12 Months Ended
		Sep. 30, 2015		Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value (in Dollars)		$ 1,038		$ 3,827
Nonrecurring fair value measurements		1,038		3,827
Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value (in Dollars)		903		3,715
Nonrecurring fair value measurements		903		3,715
Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value (in Dollars)		135		112
Nonrecurring fair value measurements		135		112
Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value (in Dollars)		1,038		3,827
Nonrecurring fair value measurements		1,038		3,827
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value (in Dollars)		903		3,715
Nonrecurring fair value measurements		903		3,715
Fair Value, Inputs, Level 3 [Member] | Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value (in Dollars)		135		112
Nonrecurring fair value measurements		135		112
Fair Value, Inputs, Level 3 [Member] | Income Approach Valuation Technique [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value (in Dollars)	[1],[2]	$ 793		$ 953
Appraisal adjustments	[1],[2]
Nonrecurring fair value measurements	[1],[2]	$ 793		$ 953
Liquidation expenses	[3]	10.00%		10.00%
Fair Value, Inputs, Level 3 [Member] | Market Approach Valuation Technique [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value (in Dollars)	[4]	$ 110	[3]	$ 112
Nonrecurring fair value measurements	[4]	$ 110	[3]	$ 112
Discount rate	[4]	6.375%	[3]	6.375%
Fair Value, Inputs, Level 3 [Member] | Market Approach Valuation Technique [Member] | Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value (in Dollars)		$ 135		$ 112
Nonrecurring fair value measurements		$ 135		112
Fair Value, Inputs, Level 3 [Member] | Agreement of Sale [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value (in Dollars)	[5]			2,650
Nonrecurring fair value measurements	[5]			$ 2,650
Fair Value, Inputs, Level 3 [Member] | Minimum [Member] | Income Approach Valuation Technique [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraisal adjustments	[1],[2]	10.00%		20.00%
Liquidation expenses	[3]
Fair Value, Inputs, Level 3 [Member] | Minimum [Member] | Market Approach Valuation Technique [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	[4]		[3]
Fair Value, Inputs, Level 3 [Member] | Minimum [Member] | Market Approach Valuation Technique [Member] | Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate		10.00%		10.00%
Remaining term		2 years		2 years
Fair Value, Inputs, Level 3 [Member] | Maximum [Member] | Income Approach Valuation Technique [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Appraisal adjustments	[1],[2]	100.00%		100.00%
Liquidation expenses	[3]
Fair Value, Inputs, Level 3 [Member] | Maximum [Member] | Market Approach Valuation Technique [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	[4]		[3]
Fair Value, Inputs, Level 3 [Member] | Maximum [Member] | Market Approach Valuation Technique [Member] | Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate		12.00%		12.00%
Remaining term		23 years		28 years

[1] Appraisals may be adjusted by management for qualitative factors such as economic conditions and the age of the appraisal. The range is presented as a percent of the initial appraised value.

[2] Fair value is primarily determined through appraisals of the underlying collateral by independent parties, which generally includes various level 3 inputs which are not always identifiable.

[3] Appraisals and pending agreements of sale are adjusted by management for estimated liquidation expenses. The range is presented as a percent of the initial appraised value.

[4] Fair value is determined using the cash flow of the borrower and the effective interest rate of the original note.

[5] Fair value is determined by the net amount due.