Note 3 - Loans Receivable (Detail) - Loans Receivable (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Construction loans:
Loans by Class	$ 277,259	$ 274,937
Less allowance for loan losses	(3,799)	(3,790)	(3,979)
Loans, net	273,460	271,147
Construction Residential [Member]
Construction loans:
Loans by Class	5,882	5,036
Less allowance for loan losses	(132)	(117)	(90)
Land Acquistion, Development and Commercial [Member]
Construction loans:
Loans by Class	21,934	20,198
Less allowance for loan losses	(845)	(811)	(953)
Real Estate Residential [Member]
Construction loans:
Loans by Class	69,757	69,691
Less allowance for loan losses	(793)	(725)	(538)
Real Estate Commercial [Member]
Construction loans:
Loans by Class	107,892	109,302
Less allowance for loan losses	(1,062)	(1,054)	(1,314)
Commercial, Industrial and Agricultural [Member]
Construction loans:
Loans by Class	43,763	42,382
Less allowance for loan losses	(417)	(459)	(628)
Equity Lines [Member]
Construction loans:
Loans by Class	19,465	20,504
Less allowance for loan losses	(363)	(386)	(313)
Consumer [Member]
Construction loans:
Loans by Class	8,566	7,824
Less allowance for loan losses	$ (134)	$ (145)	$ (143)

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 8, 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

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

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph a(ii)

-Chapter V

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

+ Details

- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References+ Details