Note 6 - Loans (Details) - Loans Secured by Commercial Real Estate by Category - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Development commercial real estate loans
Loans, gross (in Dollars)	$ 824,008	$ 805,059	$ 753,049
Percentage of loans, gross	100.00%	100.00%
Commercial Real Estate Portfolio Segment [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 425,154	$ 430,025	$ 441,170
Percentage of loans, gross	51.60%	53.40%
Percentage of Bank's total regulatory capital	286.90%
Commercial Real Estate Portfolio Segment [Member] | Land Unimproved Related to Development Commercial Real Estate Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 14,507
Percentage of loans, gross	1.80%
Percentage of Bank's total regulatory capital	9.80%
Commercial Real Estate Portfolio Segment [Member] | Land Development Commercial Related to Development Commercial Real Esate Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 12,699
Percentage of loans, gross	1.50%
Percentage of Bank's total regulatory capital	8.60%
Commercial Real Estate Portfolio Segment [Member] | Land Development Residential Related to Development Commercial Real Estate Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 5,899
Percentage of loans, gross	0.70%
Percentage of Bank's total regulatory capital	4.00%
Commercial Real Estate Portfolio Segment [Member] | Retail Related to Development Commercial Real Estate Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 4,996
Percentage of loans, gross	0.60%
Percentage of Bank's total regulatory capital	3.40%
Commercial Real Estate Portfolio Segment [Member] | Multifamily Related to Development Commercial Real Estate Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 428
Percentage of loans, gross	0.10%
Percentage of Bank's total regulatory capital	0.30%
Commercial Real Estate Portfolio Segment [Member] | Industrial and Warehouse Related to Development Commercial Real Estate Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 240
Percentage of Bank's total regulatory capital	0.10%
Commercial Real Estate Portfolio Segment [Member] | Miscellaneous Commercial Related to Development Commercial Real Estate Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 184
Percentage of Bank's total regulatory capital	0.10%
Commercial Real Estate Portfolio Segment [Member] | Development Commercial Real Estate Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 38,953
Percentage of loans, gross	4.70%
Percentage of Bank's total regulatory capital	26.30%
Commercial Real Estate Portfolio Segment [Member] | Hotel/Motel Related to Existing and Other Commercial Real Estate Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 34,201
Percentage of loans, gross	4.20%
Percentage of Bank's total regulatory capital	23.10%
Commercial Real Estate Portfolio Segment [Member] | Retail Related to Existing and Other Commercial Real Estate Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 35,450
Percentage of loans, gross	4.30%
Percentage of Bank's total regulatory capital	23.90%
Commercial Real Estate Portfolio Segment [Member] | Office Related to Existing and Other Commercial Real Estate Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 26,506
Percentage of loans, gross	3.20%
Percentage of Bank's total regulatory capital	17.90%
Commercial Real Estate Portfolio Segment [Member] | Multifamily Related to Existing and Other Commercial Real Estate Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 8,473
Percentage of loans, gross	1.00%
Percentage of Bank's total regulatory capital	5.70%
Commercial Real Estate Portfolio Segment [Member] | Industrial and Warehouse Related to Existing and Other Commercial Real Estate Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 5,636
Percentage of loans, gross	0.70%
Percentage of Bank's total regulatory capital	3.80%
Commercial Real Estate Portfolio Segment [Member] | Healthcare Related to Existing and Other Commercial Real Estate Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 12,846
Percentage of loans, gross	1.60%
Percentage of Bank's total regulatory capital	8.70%
Commercial Real Estate Portfolio Segment [Member] | Miscellaneous Commercial Related to Existing and Other Commercial Real Estates Loans[Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 98,367
Percentage of loans, gross	11.90%
Percentage of Bank's total regulatory capital	66.40%
Commercial Real Estate Portfolio Segment [Member] | Residential Construction Speculative Related to Existing and Other Commercial Real Estate Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 381
Percentage of Bank's total regulatory capital	0.20%
Commercial Real Estate Portfolio Segment [Member] | Existing And Other Commercial Real Estate Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 221,860
Percentage of loans, gross	26.90%
Percentage of Bank's total regulatory capital	149.70%
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Related to Commercial Real Estate Owner Occupied and Residential Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 146,425
Percentage of loans, gross	17.80%
Percentage of Bank's total regulatory capital	98.80%
Commercial Real Estate Portfolio Segment [Member] | Commercial Construction Owner Occupied Related to Commercial Real Estate Owner Occupied and Residential Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 7,341
Percentage of loans, gross	0.90%
Percentage of Bank's total regulatory capital	5.00%
Commercial Real Estate Portfolio Segment [Member] | Residential Construction Owner Occupied Related to Commerical Real Estate Owner Occupied and Residential Loans [Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 10,575
Percentage of loans, gross	1.30%
Percentage of Bank's total regulatory capital	7.10%
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied and Residential Loans[Member]
Development commercial real estate loans
Loans, gross (in Dollars)	$ 164,341
Percentage of loans, gross	20.00%
Percentage of Bank's total regulatory capital	110.90%