Note 4 - Loans and Allowance for Loan Losses (Details) - Troubled Debt Restructurings, Excluding Loans Acquired, Segregated by Class of Loans $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014	Jun. 30, 2015 USD ($)	Jun. 30, 2014	Dec. 31, 2014 USD ($)
Financing Receivable, Modifications [Line Items]
Number	5	1	7	2
Loans, Excluding Acquired Loans [Member]
Financing Receivable, Modifications [Line Items]
Number			14		8
Balance	$ 3,797		$ 3,797		$ 3,241
Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Number			5		5
Balance	1,959		$ 1,959		$ 2,233
Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Number			9		3
Balance	$ 1,838		$ 1,838		$ 1,008
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number	5		7	1
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Financing Receivable, Modifications [Line Items]
Number	4		6	1
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Financing Receivable, Modifications [Line Items]
Number			14		8
Balance	$ 3,797		$ 3,797		$ 3,241
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member] | Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Number			1		1
Balance	263		$ 263		$ 391
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member] | Single Family Residential Loans [Member]
Financing Receivable, Modifications [Line Items]
Number			8		3
Balance	1,090		$ 1,090		$ 396
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member] | Other Loans [Member]
Financing Receivable, Modifications [Line Items]
Number			5		4
Balance	2,444		$ 2,444		$ 2,454
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Number			5		5
Balance	1,959		$ 1,959		$ 2,233
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Single Family Residential Loans [Member]
Financing Receivable, Modifications [Line Items]
Number			2		2
Balance	137		$ 137		$ 393
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member] | Performing Financial Instruments [Member] | Other Loans [Member]
Financing Receivable, Modifications [Line Items]
Number			3		3
Balance	1,822		$ 1,822		$ 1,840
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Number			9		3
Balance	1,838		$ 1,838		$ 1,008
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Number			1		1
Balance	263		$ 263		$ 391
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Single Family Residential Loans [Member]
Financing Receivable, Modifications [Line Items]
Number			6		1
Balance	953		$ 953		$ 3
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member] | Nonperforming Financial Instruments [Member] | Other Loans [Member]
Financing Receivable, Modifications [Line Items]
Number			2		1
Balance	$ 622		$ 622		$ 614