Note 7 - Impaired Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Commercial Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	$ 18,965	$ 15,493
Loans with no related allowance, recorded investment	12,774	6,721
Loans with related allowance, unpaid principal balance	6,342	7,757
Loans with related allowance, recorded investment	5,426	6,847
Allowance	1,394	530
Real Estate Construction Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	27,331	51,290
Loans with no related allowance, recorded investment	6,081	22,002
Commercial Real Estate Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	67,496	59,954
Loans with no related allowance, recorded investment	60,796	54,625
Loans with related allowance, unpaid principal balance	26,894	28,258
Loans with related allowance, recorded investment	24,733	27,152
Allowance	5,891	6,792
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	4,312	3,233
Loans with no related allowance, recorded investment	4,161	3,026
Loans with related allowance, unpaid principal balance	14,925	14,383
Loans with related allowance, recorded investment	13,875	13,437
Allowance	439	427
Loans with no related allowance, unpaid principal balance	118,104	129,970
Loans with no related allowance, recorded investment	83,812	86,374
Loans with related allowance, unpaid principal balance	48,161	50,398
Loans with related allowance, recorded investment	44,034	47,436
Allowance	7,724	7,749
Total impaired loans, Unpaid Principal Balance	166,265	180,368
Total impaired loans, Recorded Investment	$ 127,846	$ 133,810