Note 3 - Loans - Internally Assigned Risk Grades of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Commercial and Industrial Portfolio Segment [Member] | Pass [Member]
Loans	$ 693,830	$ 612,853
Commercial and Industrial Portfolio Segment [Member] | Special Mention [Member]
Loans	18,929	19,672
Commercial and Industrial Portfolio Segment [Member] | Substandard [Member] | Performing Financial Instruments [Member]
Loans	6,446	7,238
Commercial and Industrial Portfolio Segment [Member] | Substandard [Member] | Nonperforming Financial Instruments [Member]
Loans	2,751	4,635
Commercial and Industrial Portfolio Segment [Member] | Doubtful [Member]
Loans
Commercial and Industrial Portfolio Segment [Member]
Loans	721,956	644,398
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member] | Pass [Member]
Loans	134,823	133,342
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member] | Special Mention [Member]
Loans		773
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member] | Substandard [Member] | Performing Financial Instruments [Member]
Loans	1,206	367
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member] | Substandard [Member] | Nonperforming Financial Instruments [Member]
Loans
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member] | Doubtful [Member]
Loans
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]
Loans	136,029	134,482
Undevelopment Land Portfolio Segment [Member] | Pass [Member]
Loans	19,681	20,513
Undevelopment Land Portfolio Segment [Member] | Special Mention [Member]
Loans		517
Undevelopment Land Portfolio Segment [Member] | Substandard [Member] | Performing Financial Instruments [Member]
Loans	661	155
Undevelopment Land Portfolio Segment [Member] | Substandard [Member] | Nonperforming Financial Instruments [Member]
Loans
Undevelopment Land Portfolio Segment [Member] | Doubtful [Member]
Loans
Undevelopment Land Portfolio Segment [Member]
Loans	20,342	21,185
Real Estate Mortgage Portfolio Segment [Member] | Pass [Member] | Commercial Investment [Member]
Loans	570,100	525,829
Real Estate Mortgage Portfolio Segment [Member] | Pass [Member] | Owner Occupied Commercial [Member]
Loans	321,684	306,056
Real Estate Mortgage Portfolio Segment [Member] | Pass [Member] | One to Four Family Residential [Member]
Loans	239,429	224,645
Real Estate Mortgage Portfolio Segment [Member] | Pass [Member] | Home Equity First Lien [Member]
Loans	52,360	50,102
Real Estate Mortgage Portfolio Segment [Member] | Pass [Member] | Home Equity Junior Lien [Member]
Loans	65,696	62,924
Real Estate Mortgage Portfolio Segment [Member] | Pass [Member]
Loans	1,249,269	1,169,556
Real Estate Mortgage Portfolio Segment [Member] | Special Mention [Member] | Commercial Investment [Member]
Loans	1,918	2,183
Real Estate Mortgage Portfolio Segment [Member] | Special Mention [Member] | Owner Occupied Commercial [Member]
Loans	8,452	17,135
Real Estate Mortgage Portfolio Segment [Member] | Special Mention [Member] | One to Four Family Residential [Member]
Loans	295	848
Real Estate Mortgage Portfolio Segment [Member] | Special Mention [Member] | Home Equity First Lien [Member]
Loans
Real Estate Mortgage Portfolio Segment [Member] | Special Mention [Member] | Home Equity Junior Lien [Member]
Loans	50	50
Real Estate Mortgage Portfolio Segment [Member] | Special Mention [Member]
Loans	10,715	20,216
Real Estate Mortgage Portfolio Segment [Member] | Substandard [Member] | Performing Financial Instruments [Member] | Commercial Investment [Member]
Loans
Real Estate Mortgage Portfolio Segment [Member] | Substandard [Member] | Performing Financial Instruments [Member] | Owner Occupied Commercial [Member]
Loans	1,890	3,413
Real Estate Mortgage Portfolio Segment [Member] | Substandard [Member] | Performing Financial Instruments [Member] | One to Four Family Residential [Member]
Loans
Real Estate Mortgage Portfolio Segment [Member] | Substandard [Member] | Performing Financial Instruments [Member] | Home Equity First Lien [Member]
Loans
Real Estate Mortgage Portfolio Segment [Member] | Substandard [Member] | Performing Financial Instruments [Member] | Home Equity Junior Lien [Member]
Loans
Real Estate Mortgage Portfolio Segment [Member] | Substandard [Member] | Performing Financial Instruments [Member]
Loans	1,890	3,413
Real Estate Mortgage Portfolio Segment [Member] | Substandard [Member] | Nonperforming Financial Instruments [Member] | Commercial Investment [Member]
Loans	420	278
Real Estate Mortgage Portfolio Segment [Member] | Substandard [Member] | Nonperforming Financial Instruments [Member] | Owner Occupied Commercial [Member]
Loans	1,836	2,761
Real Estate Mortgage Portfolio Segment [Member] | Substandard [Member] | Nonperforming Financial Instruments [Member] | One to Four Family Residential [Member]
Loans	1,046	1,082
Real Estate Mortgage Portfolio Segment [Member] | Substandard [Member] | Nonperforming Financial Instruments [Member] | Home Equity First Lien [Member]
Loans		13
Real Estate Mortgage Portfolio Segment [Member] | Substandard [Member] | Nonperforming Financial Instruments [Member] | Home Equity Junior Lien [Member]
Loans	253	92
Real Estate Mortgage Portfolio Segment [Member] | Substandard [Member] | Nonperforming Financial Instruments [Member]
Loans	3,555	4,226
Real Estate Mortgage Portfolio Segment [Member] | Doubtful [Member] | Commercial Investment [Member]
Loans
Real Estate Mortgage Portfolio Segment [Member] | Doubtful [Member] | Owner Occupied Commercial [Member]
Loans
Real Estate Mortgage Portfolio Segment [Member] | Doubtful [Member] | One to Four Family Residential [Member]
Loans
Real Estate Mortgage Portfolio Segment [Member] | Doubtful [Member] | Home Equity First Lien [Member]
Loans
Real Estate Mortgage Portfolio Segment [Member] | Doubtful [Member] | Home Equity Junior Lien [Member]
Loans
Real Estate Mortgage Portfolio Segment [Member] | Doubtful [Member]
Loans
Real Estate Mortgage Portfolio Segment [Member] | Commercial Investment [Member]
Loans	572,438	528,290
Real Estate Mortgage Portfolio Segment [Member] | Owner Occupied Commercial [Member]
Loans	333,862	329,365
Real Estate Mortgage Portfolio Segment [Member] | One to Four Family Residential [Member]
Loans	240,770	226,575
Real Estate Mortgage Portfolio Segment [Member] | Home Equity First Lien [Member]
Loans	52,360	50,115
Real Estate Mortgage Portfolio Segment [Member] | Home Equity Junior Lien [Member]
Loans	65,999	63,066
Real Estate Mortgage Portfolio Segment [Member]
Loans	1,265,429	1,197,411
Consumer Portfolio Segment [Member] | Pass [Member]
Loans	31,701	35,463
Consumer Portfolio Segment [Member] | Special Mention [Member]
Loans
Consumer Portfolio Segment [Member] | Substandard [Member] | Performing Financial Instruments [Member]
Loans
Consumer Portfolio Segment [Member] | Substandard [Member] | Nonperforming Financial Instruments [Member]
Loans	94	68
Consumer Portfolio Segment [Member] | Doubtful [Member]
Loans
Consumer Portfolio Segment [Member]
Loans	31,795	35,531
Pass [Member]
Loans	2,129,304	1,971,727
Special Mention [Member]
Loans	29,644	41,178
Substandard [Member] | Performing Financial Instruments [Member]
Loans	10,203	11,173
Substandard [Member] | Nonperforming Financial Instruments [Member]
Loans	6,400	8,929
Doubtful [Member]
Loans
Loans	$ 2,175,551	$ 2,033,007