Note 4 - Loans and Allowance for Credit Losses (Details) - Loans Modified in a TDR by Class (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Troubled Debt Restructuring [Member] Commercial Loan [Member] Nonperforming Financing Receivable [Member]	Dec. 31, 2013 Troubled Debt Restructuring [Member] Commercial Loan [Member] Nonperforming Financing Receivable [Member]	Mar. 31, 2014 Troubled Debt Restructuring [Member] Commercial Loan [Member]	Dec. 31, 2013 Troubled Debt Restructuring [Member] Commercial Loan [Member]	Mar. 31, 2014 Troubled Debt Restructuring [Member] Commercial Real Estate Investment [Member] Performing Financing Receivable [Member]	Dec. 31, 2013 Troubled Debt Restructuring [Member] Commercial Real Estate Investment [Member] Performing Financing Receivable [Member]	Dec. 31, 2013 Troubled Debt Restructuring [Member] Commercial Real Estate Investment [Member] Nonperforming Financing Receivable [Member]	Mar. 31, 2014 Troubled Debt Restructuring [Member] Commercial Real Estate Investment [Member]	Dec. 31, 2013 Troubled Debt Restructuring [Member] Commercial Real Estate Investment [Member]	Mar. 31, 2014 Troubled Debt Restructuring [Member] Commercial Real Estate Owner Occupied [Member] Nonperforming Financing Receivable [Member]	Dec. 31, 2013 Troubled Debt Restructuring [Member] Commercial Real Estate Owner Occupied [Member] Nonperforming Financing Receivable [Member]	Mar. 31, 2014 Troubled Debt Restructuring [Member] Commercial Real Estate Owner Occupied [Member]	Dec. 31, 2013 Troubled Debt Restructuring [Member] Commercial Real Estate Owner Occupied [Member]	Mar. 31, 2014 Troubled Debt Restructuring [Member] Construction, Commercial And Residential [Member] Performing Financing Receivable [Member]	Dec. 31, 2013 Troubled Debt Restructuring [Member] Construction, Commercial And Residential [Member] Performing Financing Receivable [Member]	Mar. 31, 2014 Troubled Debt Restructuring [Member] Construction, Commercial And Residential [Member] Nonperforming Financing Receivable [Member]	Dec. 31, 2013 Troubled Debt Restructuring [Member] Construction, Commercial And Residential [Member] Nonperforming Financing Receivable [Member]	Mar. 31, 2014 Troubled Debt Restructuring [Member] Construction, Commercial And Residential [Member]	Dec. 31, 2013 Troubled Debt Restructuring [Member] Construction, Commercial And Residential [Member]	Mar. 31, 2014 Troubled Debt Restructuring [Member] Performing Financing Receivable [Member]	Dec. 31, 2013 Troubled Debt Restructuring [Member] Performing Financing Receivable [Member]	Mar. 31, 2014 Troubled Debt Restructuring [Member] Nonperforming Financing Receivable [Member]	Dec. 31, 2013 Troubled Debt Restructuring [Member] Nonperforming Financing Receivable [Member]	Mar. 31, 2014 Troubled Debt Restructuring [Member]	Dec. 31, 2013 Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	0	0			1	3				2	3			1	1					2	2					6	9
TDRs			$ 1,947	$ 4,042	$ 1,947	$ 4,042	$ 3,370	$ 3,377	$ 217	$ 3,370	$ 3,594	$ 4,081	$ 4,081	$ 4,081	$ 4,081	$ 4,567	$ 4,567	$ 912	$ 912	$ 5,479	$ 5,479	$ 7,937	$ 7,944	$ 6,940	$ 9,252	$ 14,877	$ 17,196