Note 7 - Loans - Impaired Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Commercial Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	$ 29,794	$ 15,493
Loans with no related allowance, recorded investment	29,414	6,721
Loans with related allowance, unpaid principal balance	3,315	7,757
Loans with related allowance, recorded investment	3,217	6,847
Allowance	1,320	530
Real Estate Construction Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	5,776	51,290
Loans with no related allowance, recorded investment	5,507	22,002
Commercial Real Estate Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	72,319	59,954
Loans with no related allowance, recorded investment	64,298	54,625
Loans with related allowance, unpaid principal balance	10,425	28,258
Loans with related allowance, recorded investment	10,289	27,152
Allowance	1,248	6,792
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	4,832	3,233
Loans with no related allowance, recorded investment	4,675	3,026
Loans with related allowance, unpaid principal balance	14,637	14,383
Loans with related allowance, recorded investment	13,514	13,437
Allowance	375	427
Loans with no related allowance, unpaid principal balance	112,721	129,970
Loans with no related allowance, recorded investment	103,894	86,374
Loans with related allowance, unpaid principal balance	28,377	50,398
Loans with related allowance, recorded investment	27,020	47,436
Allowance	2,943	7,749
Total impaired loans, Unpaid Principal Balance	141,098	180,368
Total impaired loans, Recorded Investment	$ 130,914	$ 133,810