Note 5 - Loans (Details) - Loans Secured by Commercial Real Estate by Category (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	$ 756,814	$ 738,282	$ 733,940
Land Unimproved [Member] | Development Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	21,013
Percentage of gross loans	2.80%
Percentage of Bank's total regulatory capital	16.60%
Land Development Commercial [Member] | Development Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	6,010
Percentage of gross loans	0.80%
Percentage of Bank's total regulatory capital	4.70%
Land Development Residential [Member] | Development Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	7,904
Percentage of gross loans	1.00%
Percentage of Bank's total regulatory capital	6.20%
Commercial Construction Retail [Member] | Development Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	5,550
Percentage of gross loans	0.70%
Percentage of Bank's total regulatory capital	4.40%
Commercial Construction Retail [Member] | Existing And Other Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	25,739
Percentage of gross loans	3.40%
Percentage of Bank's total regulatory capital	20.30%
Multi Family [Member] | Development Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	8,318
Percentage of gross loans	1.10%
Percentage of Bank's total regulatory capital	6.60%
Multi Family [Member] | Existing And Other Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	10,695
Percentage of gross loans	1.40%
Percentage of Bank's total regulatory capital	8.40%
Industrial And Warehouse [Member] | Development Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	1,281
Percentage of gross loans	0.20%
Percentage of Bank's total regulatory capital	1.00%
Industrial And Warehouse [Member] | Existing And Other Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	6,664
Percentage of gross loans	0.90%
Percentage of Bank's total regulatory capital	5.30%
Miscellaneous Commercial [Member] | Development Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	7,001
Percentage of gross loans	0.90%
Percentage of Bank's total regulatory capital	5.50%
Miscellaneous Commercial [Member] | Existing And Other Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	114,524
Percentage of gross loans	15.10%
Percentage of Bank's total regulatory capital	90.20%
Hotel/Motel [Member] | Existing And Other Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	56,807
Percentage of gross loans	7.50%
Percentage of Bank's total regulatory capital	44.80%
Office Loan [Member] | Existing And Other Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	11,103
Percentage of gross loans	1.50%
Percentage of Bank's total regulatory capital	8.70%
Health Care [Member] | Existing And Other Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	14,071
Percentage of gross loans	1.90%
Percentage of Bank's total regulatory capital	11.10%
Real Estate Construction - Speculative [Member] | Existing And Other Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	369
Percentage of gross loans	0.00%
Percentage of Bank's total regulatory capital	0.30%
Commercial Owner Occupied [Member] | Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	140,056
Percentage of gross loans	18.50%
Percentage of Bank's total regulatory capital	110.30%
Commercial Construction Owner Occupied [Member] | Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	9,617
Percentage of gross loans	1.30%
Percentage of Bank's total regulatory capital	7.60%
Residential Construction Contract [Member] | Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	8,336
Percentage of gross loans	1.10%
Percentage of Bank's total regulatory capital	6.60%
Commercial Real Estate Portfolio Segment [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	455,058
Percentage of gross loans	60.10%
Percentage of Bank's total regulatory capital	358.60%
Development Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	57,077
Percentage of gross loans	7.50%
Percentage of Bank's total regulatory capital	45.00%
Existing And Other Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	239,972
Percentage of gross loans	31.70%
Percentage of Bank's total regulatory capital	189.10%
Commercial Real Estate Loans [Member]
Development commercial real estate loans
Total commercial real estate loans (in Dollars)	$ 158,009
Percentage of gross loans	20.90%
Percentage of Bank's total regulatory capital	124.50%