Note 5 - Loans and Allowance for Loan Losses (Detail) - Commercial Loans by Credit Quality Indicators (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Total [Member] | Commercial and Industrial [Member]
Loans receivable		$ 119,132
Total [Member] | Commercial Real Estate Owner Occupied [Member]
Loans receivable		299,416
Total [Member] | Commercial Real Estate Investor Income Producing [Member]
Loans receivable		371,957
Total [Member] | Acquisition, Construction, and Development Portfolio [Member]
Loans receivable		140,661
Total [Member] | Other Commercial [Member]
Loans receivable		5,628
Total [Member] | Total Commercial [Member]
Loans receivable		936,794
Pass [Member] | Commercial and Industrial [Member]
Loans receivable	115,632	115,907
Pass [Member] | Commercial Real Estate Owner Occupied [Member]
Loans receivable	279,777	292,418
Pass [Member] | Commercial Real Estate Investor Income Producing [Member]
Loans receivable	356,707	361,212
Pass [Member] | Acquisition, Construction, and Development Portfolio [Member]
Loans receivable	130,541	126,167
Pass [Member] | Other Commercial [Member]
Loans receivable	4,729	5,460
Pass [Member] | Total Commercial [Member]
Loans receivable	887,386	901,164
Special Mention [Member] | Commercial and Industrial [Member]
Loans receivable	226	173
Special Mention [Member] | Commercial Real Estate Owner Occupied [Member]
Loans receivable	2,779	3,804
Special Mention [Member] | Commercial Real Estate Investor Income Producing [Member]
Loans receivable	5,851	5,564
Special Mention [Member] | Acquisition, Construction, and Development Portfolio [Member]
Loans receivable	6,478	9,252
Special Mention [Member] | Total Commercial [Member]
Loans receivable	15,334	18,793
Classified [Member] | Commercial and Industrial [Member]
Loans receivable	2,938	3,052
Classified [Member] | Commercial Real Estate Owner Occupied [Member]
Loans receivable	2,797	3,194
Classified [Member] | Commercial Real Estate Investor Income Producing [Member]
Loans receivable	4,876	5,181
Classified [Member] | Acquisition, Construction, and Development Portfolio [Member]
Loans receivable	3,850	5,242
Classified [Member] | Other Commercial [Member]
Loans receivable	165	168
Classified [Member] | Total Commercial [Member]
Loans receivable	14,626	16,837
Total Consumer Loans [Member] | Commercial and Industrial [Member]
Loans receivable	118,796
Total Consumer Loans [Member] | Commercial Real Estate Owner Occupied [Member]
Loans receivable	285,353
Total Consumer Loans [Member] | Commercial Real Estate Investor Income Producing [Member]
Loans receivable	367,434
Total Consumer Loans [Member] | Acquisition, Construction, and Development Portfolio [Member]
Loans receivable	140,869
Total Consumer Loans [Member] | Other Commercial [Member]
Loans receivable	4,894
Total Consumer Loans [Member] | Total Commercial [Member]
Loans receivable	$ 917,346