Note 4 - Loans and Allowance for Credit Losses (Details) - Impaired loans (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Commercial [Member]
Impaired loans with no related allowance recorded:
Impaired loans with no related allowance recorded, recorded investment	$ 9,717	$ 3,100
Impaired loans with no related allowance recorded, unpaid principal balance	17,846	9,506
Impaired loans with an allowance recorded:
Impaired loans with an allowance recorded, recorded investment	1,000	12,129
Impaired loans with an allowance recorded, unpaid principal balance	2,173	13,739
Impaired loans with an allowance recorded, related allowance	100	2,588
Total:
Recorded Investment	10,717	15,229
Unpaid Principal Balance	20,019	23,245
Related Allowance	100	2,588
Commercial Real Estate Loans [Member]
Impaired loans with no related allowance recorded:
Impaired loans with no related allowance recorded, recorded investment	21,536	24,135
Impaired loans with no related allowance recorded, unpaid principal balance	24,652	27,972
Impaired loans with an allowance recorded:
Impaired loans with an allowance recorded, recorded investment	3,954	4,038
Impaired loans with an allowance recorded, unpaid principal balance	3,954	4,038
Impaired loans with an allowance recorded, related allowance	147	164
Total:
Recorded Investment	25,490	28,173
Unpaid Principal Balance	28,606	32,010
Related Allowance	147	164
Construction [Member]
Impaired loans with no related allowance recorded:
Impaired loans with no related allowance recorded, recorded investment	2,935	2,363
Impaired loans with no related allowance recorded, unpaid principal balance	3,369	2,992
Total:
Recorded Investment	2,935	2,363
Unpaid Principal Balance	3,369	2,992
Residential Real Estate Loans [Member]
Impaired loans with no related allowance recorded:
Impaired loans with no related allowance recorded, recorded investment	414	668
Impaired loans with no related allowance recorded, unpaid principal balance	414	668
Total:
Recorded Investment	414	668
Unpaid Principal Balance	414	668
Consumer Installment And Other [Member]
Impaired loans with no related allowance recorded:
Impaired loans with no related allowance recorded, recorded investment	521	2,328
Impaired loans with no related allowance recorded, unpaid principal balance	627	2,616
Total:
Recorded Investment	521	2,328
Unpaid Principal Balance	$ 627	$ 2,616