Note 5 - Loans - Internally Assigned Risk Grades of Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Loans	[1]	$ 2,845,016	$ 2,548,171
Commercial and Industrial Portfolio Segment [Member]
Loans		870,511	833,524
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]
Loans	[2]	213,822	225,050
Undevelopment Land Portfolio Segment [Member]
Loans		46,360	30,092
Real Estate Mortgage Portfolio Segment [Member]
Loans		1,666,856	1,411,447
Real Estate Mortgage Portfolio Segment [Member] | Commercial Investment [Member]
Loans		736,618	588,610
Real Estate Mortgage Portfolio Segment [Member] | Owner Occupied Commercial [Member]
Loans		473,783	426,373
Real Estate Mortgage Portfolio Segment [Member] | One to Four Family Residential [Member]
Loans		334,358	276,017
Real Estate Mortgage Portfolio Segment [Member] | Home Equity First Lien [Member]
Loans		48,620	49,500
Real Estate Mortgage Portfolio Segment [Member] | Home Equity Junior Lien [Member]
Loans		73,477	70,947
Consumer Portfolio Segment [Member]
Loans		47,467	48,058
Pass [Member]
Loans		2,785,631	2,493,020
Pass [Member] | Commercial and Industrial Portfolio Segment [Member]
Loans		840,105	803,073
Pass [Member] | Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]
Loans		213,822	220,532
Pass [Member] | Undevelopment Land Portfolio Segment [Member]
Loans		46,360	29,618
Pass [Member] | Real Estate Mortgage Portfolio Segment [Member]
Loans		1,637,915	1,391,739
Pass [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Investment [Member]
Loans		722,747	586,543
Pass [Member] | Real Estate Mortgage Portfolio Segment [Member] | Owner Occupied Commercial [Member]
Loans		460,981	411,722
Pass [Member] | Real Estate Mortgage Portfolio Segment [Member] | One to Four Family Residential [Member]
Loans		332,294	273,537
Pass [Member] | Real Estate Mortgage Portfolio Segment [Member] | Home Equity First Lien [Member]
Loans		48,620	49,500
Pass [Member] | Real Estate Mortgage Portfolio Segment [Member] | Home Equity Junior Lien [Member]
Loans		73,273	70,437
Pass [Member] | Consumer Portfolio Segment [Member]
Loans		47,429	48,058
Special Mention [Member]
Loans		10,239	28,354
Special Mention [Member] | Commercial and Industrial Portfolio Segment [Member]
Loans		704	11,516
Special Mention [Member] | Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]
Loans		0	4,200
Special Mention [Member] | Undevelopment Land Portfolio Segment [Member]
Loans		0	0
Special Mention [Member] | Real Estate Mortgage Portfolio Segment [Member]
Loans		9,535	12,638
Special Mention [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Investment [Member]
Loans		6,459	1,815
Special Mention [Member] | Real Estate Mortgage Portfolio Segment [Member] | Owner Occupied Commercial [Member]
Loans		1,375	9,030
Special Mention [Member] | Real Estate Mortgage Portfolio Segment [Member] | One to Four Family Residential [Member]
Loans		1,701	1,544
Special Mention [Member] | Real Estate Mortgage Portfolio Segment [Member] | Home Equity First Lien [Member]
Loans		0	0
Special Mention [Member] | Real Estate Mortgage Portfolio Segment [Member] | Home Equity Junior Lien [Member]
Loans		0	249
Special Mention [Member] | Consumer Portfolio Segment [Member]
Loans		0	0
Substandard [Member] | Performing Financial Instruments [Member]
Loans		37,002	23,399
Substandard [Member] | Nonperforming Financial Instruments [Member]
Loans		12,144	3,398
Substandard [Member] | Commercial and Industrial Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans		21,500	18,703
Substandard [Member] | Commercial and Industrial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans		8,202	232
Substandard [Member] | Construction and Development Excluding Undeveloped Land Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans		0	0
Substandard [Member] | Construction and Development Excluding Undeveloped Land Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans		0	318
Substandard [Member] | Undevelopment Land Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans		0	0
Substandard [Member] | Undevelopment Land Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans		0	474
Substandard [Member] | Real Estate Mortgage Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans		15,464	4,696
Substandard [Member] | Real Estate Mortgage Portfolio Segment [Member] | Performing Financial Instruments [Member] | Commercial Investment [Member]
Loans		6,275	15
Substandard [Member] | Real Estate Mortgage Portfolio Segment [Member] | Performing Financial Instruments [Member] | Owner Occupied Commercial [Member]
Loans		9,050	4,500
Substandard [Member] | Real Estate Mortgage Portfolio Segment [Member] | Performing Financial Instruments [Member] | One to Four Family Residential [Member]
Loans		122	162
Substandard [Member] | Real Estate Mortgage Portfolio Segment [Member] | Performing Financial Instruments [Member] | Home Equity First Lien [Member]
Loans		0	0
Substandard [Member] | Real Estate Mortgage Portfolio Segment [Member] | Performing Financial Instruments [Member] | Home Equity Junior Lien [Member]
Loans		17	19
Substandard [Member] | Real Estate Mortgage Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans		3,942	2,374
Substandard [Member] | Real Estate Mortgage Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Commercial Investment [Member]
Loans		1,137	237
Substandard [Member] | Real Estate Mortgage Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Owner Occupied Commercial [Member]
Loans		2,377	1,121
Substandard [Member] | Real Estate Mortgage Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | One to Four Family Residential [Member]
Loans		241	774
Substandard [Member] | Real Estate Mortgage Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Home Equity First Lien [Member]
Loans		0	0
Substandard [Member] | Real Estate Mortgage Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Home Equity Junior Lien [Member]
Loans		187	242
Substandard [Member] | Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans		38	0
Substandard [Member] | Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans		0	0
Doubtful [Member]
Loans		0	0
Doubtful [Member] | Commercial and Industrial Portfolio Segment [Member]
Loans		0	0
Doubtful [Member] | Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]
Loans		0	0
Doubtful [Member] | Undevelopment Land Portfolio Segment [Member]
Loans		0	0
Doubtful [Member] | Real Estate Mortgage Portfolio Segment [Member]
Loans		0	0
Doubtful [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Investment [Member]
Loans		0	0
Doubtful [Member] | Real Estate Mortgage Portfolio Segment [Member] | Owner Occupied Commercial [Member]
Loans		0	0
Doubtful [Member] | Real Estate Mortgage Portfolio Segment [Member] | One to Four Family Residential [Member]
Loans		0	0
Doubtful [Member] | Real Estate Mortgage Portfolio Segment [Member] | Home Equity First Lien [Member]
Loans		0	0
Doubtful [Member] | Real Estate Mortgage Portfolio Segment [Member] | Home Equity Junior Lien [Member]
Loans		0	0
Doubtful [Member] | Consumer Portfolio Segment [Member]
Loans		$ 0	$ 0

[1] Total loans are presented inclusive of premiums, discounts, and net loan origination fees and costs.

[2] Consists of land acquired for development by the borrower, but for which no development has yet taken place.