Note 9 - Junior Subordinate Debentures (Detail) - Junior Subordinated Debentures (USD $)	Dec. 31, 2012	Dec. 31, 2011
Junior subordinated debentures	$ 36,085,000	$ 36,085,000
Note Payable to Trust II [Member]
Junior subordinated debentures	12,372,000	12,372,000
Note Payable to Trust III [Member]
Junior subordinated debentures	8,248,000	8,248,000
Note Payable to Trust IV [Member]
Junior subordinated debentures	5,155,000	5,155,000
Note Payable to Trust V [Member]
Junior subordinated debentures	$ 10,310,000	$ 10,310,000

Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Name:	us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant