Note 6 - Loans (Details) - Internal Credit Quality Indicators of Gross Loans - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		$ 824,008	$ 805,059	$ 753,049
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		425,154	430,025	441,170
Commercial Real Estate Portfolio Segment [Member] | Grade Three [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		67,439	78,447
Commercial Real Estate Portfolio Segment [Member] | Grade Four [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		227,199	202,846
Commercial Real Estate Portfolio Segment [Member] | Grade W [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		71,080	79,714
Commercial Real Estate Portfolio Segment [Member] | Grade Five [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		13,899	25,640
Commercial Real Estate Portfolio Segment [Member] | Grade Six [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		27,731	26,855
Commercial Real Estate Portfolio Segment [Member] | Grade Seven [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		1,003	1,051
Commercial Real Estate Portfolio Segment [Member] | Not Risk Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	[1]	16,803	15,472
Commercial Real Estate Portfolio Segment [Member] | Construction, Land Development and Other Land Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		57,250	48,063
Commercial Real Estate Portfolio Segment [Member] | Construction, Land Development and Other Land Loan [Member] | Grade Three [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		1,372	3,337
Commercial Real Estate Portfolio Segment [Member] | Construction, Land Development and Other Land Loan [Member] | Grade Four [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		28,339	17,826
Commercial Real Estate Portfolio Segment [Member] | Construction, Land Development and Other Land Loan [Member] | Grade W [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		9,594	9,595
Commercial Real Estate Portfolio Segment [Member] | Construction, Land Development and Other Land Loan [Member] | Grade Five [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		80	138
Commercial Real Estate Portfolio Segment [Member] | Construction, Land Development and Other Land Loan [Member] | Grade Six [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		1,361	1,724
Commercial Real Estate Portfolio Segment [Member] | Construction, Land Development and Other Land Loan [Member] | Not Risk Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	[1]	16,504	15,443
Commercial Real Estate Portfolio Segment [Member] | Multi Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		8,473	9,025
Commercial Real Estate Portfolio Segment [Member] | Multi Family Residential [Member] | Grade Three [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		131	144
Commercial Real Estate Portfolio Segment [Member] | Multi Family Residential [Member] | Grade Four [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		903	1,191
Commercial Real Estate Portfolio Segment [Member] | Multi Family Residential [Member] | Grade W [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		7,436	$ 7,690
Commercial Real Estate Portfolio Segment [Member] | Multi Family Residential [Member] | Not Risk Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	[1]	3
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		359,431	$ 372,937
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Grade Three [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		65,936	74,966
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Grade Four [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		197,957	183,829
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Grade W [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		54,050	62,429
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Grade Five [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		13,819	25,502
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Grade Six [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		26,370	25,131
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Grade Seven [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		1,003	1,051
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Not Risk Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	[1]	296	29
Commercial and Industrial Portfolio Segment[Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		88,489	80,927	$ 72,260
Commercial and Industrial Portfolio Segment[Member] | Grade One [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		480	753
Commercial and Industrial Portfolio Segment[Member] | Grade Two [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		2,066	1,534
Commercial and Industrial Portfolio Segment[Member] | Grade Three [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		12,019	12,864
Commercial and Industrial Portfolio Segment[Member] | Grade Four [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		68,071	53,171
Commercial and Industrial Portfolio Segment[Member] | Grade W [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		4,061	3,953
Commercial and Industrial Portfolio Segment[Member] | Grade Five [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		205	5,786
Commercial and Industrial Portfolio Segment[Member] | Grade Six [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		1,231	2,476
Commercial and Industrial Portfolio Segment[Member] | Grade Seven [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		152	339
Commercial and Industrial Portfolio Segment[Member] | Not Risk Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross		$ 204	$ 51

[1] Consumer real estate loans, included within construction, land development and other land loans, are not risk rated in accordance with the Company's policy.