Note 4 - Loans Held for Investment (Details) - Risk Ratings - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	$ 607,865	$ 481,272
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	472,688	351,719
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	338,714	255,800
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Excellent [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Above Average [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	2,788	2,030
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Average [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	98,148	53,699
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Acceptable [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	209,936	166,639
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	11,877	16,117
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	7,872	7,195
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	8,093	10,120
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	42,987	27,646
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Excellent [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Above Average [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	778
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Average [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	10,023	5,681
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Acceptable [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	31,139	17,701
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	391	2,641
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	860	515
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	574	330
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Commercial Portfolio Segment [Member] | Lots and Raw Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	28,271	27,502
Commercial Portfolio Segment [Member] | Lots and Raw Land [Member] | Excellent [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Commercial Portfolio Segment [Member] | Lots and Raw Land [Member] | Above Average [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	160	24
Commercial Portfolio Segment [Member] | Lots and Raw Land [Member] | Average [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	2,247	1,560
Commercial Portfolio Segment [Member] | Lots and Raw Land [Member] | Acceptable [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	18,086	16,601
Commercial Portfolio Segment [Member] | Lots and Raw Land [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	3,821	3,948
Commercial Portfolio Segment [Member] | Lots and Raw Land [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	2,715	3,201
Commercial Portfolio Segment [Member] | Lots and Raw Land [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	1,242	2,168
Commercial Portfolio Segment [Member] | Lots and Raw Land [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Commercial Portfolio Segment [Member] | Lots and Raw Land [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	45,481	28,379
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Excellent [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Above Average [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	3,757	955
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Average [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	8,095	5,264
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Acceptable [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	30,218	19,562
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	1,350	458
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	41	2,051
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	2,020	89
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Commercial Portfolio Segment [Member] | Lease Receivables [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	17,235	12,392
Commercial Portfolio Segment [Member] | Lease Receivables [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Commercial Portfolio Segment [Member] | Lease Receivables [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	95	69
Commercial Portfolio Segment [Member] | Lease Receivables [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Commercial Portfolio Segment [Member] | Lease Receivables [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Commercial Portfolio Segment [Member] | Lease Receivables [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	17,140	12,323
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	62,857	62,696
Consumer Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	17,239	18,863
Consumer Portfolio Segment [Member] | Real Estate Loan [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	679	636
Consumer Portfolio Segment [Member] | Real Estate Loan [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	307	431
Consumer Portfolio Segment [Member] | Real Estate Loan [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Consumer Portfolio Segment [Member] | Real Estate Loan [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Consumer Portfolio Segment [Member] | Real Estate Loan [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	16,253	17,796
Consumer Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	196	1,412
Consumer Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Consumer Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Consumer Portfolio Segment [Member] | Construction Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Consumer Portfolio Segment [Member] | Construction Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Consumer Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	196	1,412
Consumer Portfolio Segment [Member] | Lots and Raw Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	9,643	10,430
Consumer Portfolio Segment [Member] | Lots and Raw Land [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	1,270	288
Consumer Portfolio Segment [Member] | Lots and Raw Land [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	277	184
Consumer Portfolio Segment [Member] | Lots and Raw Land [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	190	0
Consumer Portfolio Segment [Member] | Lots and Raw Land [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Consumer Portfolio Segment [Member] | Lots and Raw Land [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	7,906	9,958
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	29,709	28,059
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	61	60
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	125	171
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	29,523	27,828
Consumer Portfolio Segment [Member] | Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	6,070	3,932
Consumer Portfolio Segment [Member] | Other Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	26	4
Consumer Portfolio Segment [Member] | Other Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	44	62
Consumer Portfolio Segment [Member] | Other Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Consumer Portfolio Segment [Member] | Other Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Consumer Portfolio Segment [Member] | Other Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	6,000	3,866
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	72,320	66,857
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	68,229	64,647
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	791	684
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	1,461	2,095
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	89
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	65,977	61,779
Residential Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	3,934	1,382
Residential Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Residential Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Residential Portfolio Segment [Member] | Construction Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Residential Portfolio Segment [Member] | Construction Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Residential Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	3,934	1,382
Residential Portfolio Segment [Member] | Lots and Raw Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	157	828
Residential Portfolio Segment [Member] | Lots and Raw Land [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Residential Portfolio Segment [Member] | Lots and Raw Land [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	11
Residential Portfolio Segment [Member] | Lots and Raw Land [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Residential Portfolio Segment [Member] | Lots and Raw Land [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	0	0
Residential Portfolio Segment [Member] | Lots and Raw Land [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit exposure by assigned risk grade	$ 157	$ 817