Note 20 - Stockholders' Equity (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Arkansas State Banks [Member]
State Bank Dividends to Parent Company, Maximum Percentage of Current Year Earnings	75.00%
State Bank Dividends To Parent Company, Maximum Percentage of Retained Net Earnings of Preceding Year	75.00%
Company Subsidiaries' Undivided Profits Available For Payment of Dividends to the Company [Member]
Amount Available for Dividend Distribution without Prior Approval from Regulatory Agency (in Dollars)	14.3

The amount of dividends that may be paid or declared in any calendar year without prior approval of regulatory agencies.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(e))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph e

-Article 4

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant