Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) - Impaired Loans by Class (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
With no related allowance recorded:
Impaired loans with no related allowance recorded investment	$ 10,258	$ 9,284
Impaired loans with no related allowance unpaid principal balance	10,403	9,472
With an allowance recorded:
Impaired loans with related allowance recorded investment	5,029	9,681
Impaired loans with related allowance unpaid principal balance	5,095	9,720
Impaired loans, related allowance	1,258	1,807
Total:
Impaired loans recorded investment	15,287	18,965
Impaired loans unpaid principal balance	15,498	19,192
Impaired loans, related allowance	1,258	1,807
Commercial and Industrial [Member]
With no related allowance recorded:
Impaired loans with no related allowance recorded investment	1,375	1,357
Impaired loans with no related allowance unpaid principal balance	1,375	1,357
With an allowance recorded:
Impaired loans with related allowance recorded investment	300	534
Impaired loans with related allowance unpaid principal balance	300	534
Impaired loans, related allowance	87	179
Total:
Impaired loans recorded investment	1,675	1,891
Impaired loans unpaid principal balance	1,675	1,891
Impaired loans, related allowance	87	179
Real Estate Construction [Member]
With no related allowance recorded:
Impaired loans with no related allowance recorded investment	2,965	124
Impaired loans with no related allowance unpaid principal balance	2,965	124
With an allowance recorded:
Impaired loans with related allowance recorded investment	622	3,887
Impaired loans with related allowance unpaid principal balance	622	3,887
Impaired loans, related allowance	141	210
Total:
Impaired loans recorded investment	3,587	4,011
Impaired loans unpaid principal balance	3,587	4,011
Impaired loans, related allowance	141	210
Residential Real Estate Mortgage [Member]
With no related allowance recorded:
Impaired loans with no related allowance recorded investment	1,821	2,704
Impaired loans with no related allowance unpaid principal balance	1,966	2,892
With an allowance recorded:
Impaired loans with related allowance recorded investment	3,246	3,178
Impaired loans with related allowance unpaid principal balance	3,312	3,217
Impaired loans, related allowance	858	855
Total:
Impaired loans recorded investment	5,067	5,882
Impaired loans unpaid principal balance	5,278	6,109
Impaired loans, related allowance	858	855
Commercial Real Estate Mortgage [Member]
With no related allowance recorded:
Impaired loans with no related allowance recorded investment	4,092	5,093
Impaired loans with no related allowance unpaid principal balance	4,092	5,093
With an allowance recorded:
Impaired loans with related allowance recorded investment	854	2,082
Impaired loans with related allowance unpaid principal balance	854	2,082
Impaired loans, related allowance	169	563
Total:
Impaired loans recorded investment	4,946	7,175
Impaired loans unpaid principal balance	4,946	7,175
Impaired loans, related allowance	169	563
Consumer Installment [Member]
With no related allowance recorded:
Impaired loans with no related allowance recorded investment	5	6
Impaired loans with no related allowance unpaid principal balance	5	6
With an allowance recorded:
Impaired loans with related allowance recorded investment	7
Impaired loans with related allowance unpaid principal balance	7
Impaired loans, related allowance	3
Total:
Impaired loans recorded investment	12	6
Impaired loans unpaid principal balance	12	6
Impaired loans, related allowance	$ 3