Note 5 - Loans (Details) - Internal Credit Quality Indicators of Gross Loans 2012 (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Construction, Land Development and Other Land Loan [Member] | Grade Three [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	$ 10,384
Construction, Land Development and Other Land Loan [Member] | Grade Four [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	22,384
Construction, Land Development and Other Land Loan [Member] | Grade W [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	6,735
Construction, Land Development and Other Land Loan [Member] | Grade Five [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	3,354
Construction, Land Development and Other Land Loan [Member] | Grade Six [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	4,000
Construction, Land Development and Other Land Loan [Member] | Grade Seven [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	2,780
Construction, Land Development and Other Land Loan [Member] | Not Risk Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	16,486
Construction, Land Development and Other Land Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	66,123
Multi Family Residential [Member] | Grade Three [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	404
Multi Family Residential [Member] | Grade Four [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	1,391
Multi Family Residential [Member] | Grade W [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	2,431
Multi Family Residential [Member] | Grade Five [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	7,183
Multi Family Residential [Member] | Grade Six [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	246
Multi Family Residential [Member] | Not Risk Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	4
Multi Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	11,659
Non Farm Nonresidential [Member] | Grade One [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	2,643
Non Farm Nonresidential [Member] | Grade Three [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	83,554
Non Farm Nonresidential [Member] | Grade Four [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	151,956
Non Farm Nonresidential [Member] | Grade W [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	73,306
Non Farm Nonresidential [Member] | Grade Five [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	28,910
Non Farm Nonresidential [Member] | Grade Six [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	38,328
Non Farm Nonresidential [Member] | Grade Seven [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	1,801
Non Farm Nonresidential [Member] | Not Risk Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	156
Non Farm Nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	380,654
Commercial Real Estate in Other Loans Held for Sale [Member] | Grade Seven [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	776
Commercial Real Estate in Other Loans Held for Sale [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	776
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	459,212
Less: commercial real estate included in other loans held for sale	(776)
Total	458,436
Grade One [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	2,643
Grade Three [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	94,342
Grade Four [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	175,731
Grade W [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	82,472
Grade Five [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	39,447
Grade Six [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	42,574
Grade Seven [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	5,357
Not Risk Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross loans	$ 16,646