Note 5 - Loans (Details) - Loans Secured by Commercial Real Estate by Category (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	$ 832,029	$ 805,059	$ 755,878
Percentage of loans, gross	100.00%	100.00%
Development Commercial Real Estate Loans [Member] | Land Unimproved [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	14,849
Percentage of loans, gross	1.80%
Percentage of Bank's total regulatory capital	10.20%
Development Commercial Real Estate Loans [Member] | Land Development Commercial [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	11,999
Percentage of loans, gross	1.40%
Percentage of Bank's total regulatory capital	8.20%
Development Commercial Real Estate Loans [Member] | Land Development Residential [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	5,764
Percentage of loans, gross	0.70%
Percentage of Bank's total regulatory capital	4.00%
Development Commercial Real Estate Loans [Member] | Commercial Construction Retail [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	2,551
Percentage of loans, gross	0.30%
Percentage of Bank's total regulatory capital	1.70%
Development Commercial Real Estate Loans [Member] | Miscellaneous Commercial [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	32
Development Commercial Real Estate Loans [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	35,195
Percentage of loans, gross	4.20%
Percentage of Bank's total regulatory capital	24.10%
Existing And Other Commercial Real Estate Loans [Member] | Commercial Construction Retail [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	36,824
Percentage of loans, gross	4.40%
Percentage of Bank's total regulatory capital	25.20%
Existing And Other Commercial Real Estate Loans [Member] | Miscellaneous Commercial [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	100,151
Percentage of loans, gross	12.00%
Percentage of Bank's total regulatory capital	68.70%
Existing And Other Commercial Real Estate Loans [Member] | Hotel/Motel [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	39,909
Percentage of loans, gross	4.80%
Percentage of Bank's total regulatory capital	27.40%
Existing And Other Commercial Real Estate Loans [Member] | Office Loan [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	27,201
Percentage of loans, gross	3.30%
Percentage of Bank's total regulatory capital	18.70%
Existing And Other Commercial Real Estate Loans [Member] | Multi Family [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	8,868
Percentage of loans, gross	1.10%
Percentage of Bank's total regulatory capital	6.10%
Existing And Other Commercial Real Estate Loans [Member] | Industrial And Warehouse [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	5,802
Percentage of loans, gross	0.70%
Percentage of Bank's total regulatory capital	4.00%
Existing And Other Commercial Real Estate Loans [Member] | Health Care [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	12,992
Percentage of loans, gross	1.60%
Percentage of Bank's total regulatory capital	8.90%
Existing And Other Commercial Real Estate Loans [Member] | Residential Construction Speculative [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	347
Percentage of Bank's total regulatory capital	0.20%
Existing And Other Commercial Real Estate Loans [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	232,094
Percentage of loans, gross	27.90%
Percentage of Bank's total regulatory capital	159.20%
Commercial Real Estate Loans [Member] | Commercial Owner Occupied [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	150,349
Percentage of loans, gross	18.10%
Percentage of Bank's total regulatory capital	103.10%
Commercial Real Estate Loans [Member] | Commercial Construction Owner Occupied [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	6,026
Percentage of loans, gross	0.70%
Percentage of Bank's total regulatory capital	4.20%
Commercial Real Estate Loans [Member] | Residential Construction Contract [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	6,434
Percentage of loans, gross	0.80%
Percentage of Bank's total regulatory capital	4.40%
Commercial Real Estate Loans [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	162,809
Percentage of loans, gross	19.60%
Percentage of Bank's total regulatory capital	111.70%
Commercial Real Estate Portfolio Segment [Member]
Development commercial real estate loans Secured by:
Loans, gross (in Dollars)	$ 430,098	$ 430,025
Percentage of loans, gross	51.70%
Percentage of Bank's total regulatory capital	295.00%