Note 3 - Loans and Allowance for Loan Losses (Details) - The Allowance Related to Loans Categorized as Troubled Debt Restructurings (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Commercial:
Allowance for losses, troubled debt restructurings	$ 20,954,000	$ 22,821,000	$ 26,035,000	$ 28,677,000
Commercial and Industrial [Member] | Financing Receivable Troubled Debt Restructuring [Member]
Commercial:
Allowance for losses, troubled debt restructurings	95,000	187,000
Vacant Land,Land Developement and Residential Construction [Member] | Financing Receivable Troubled Debt Restructuring [Member]
Commercial:
Allowance for losses, troubled debt restructurings	695,000	798,000
Commercial Real Estate Owner Occupied Loan [Member] | Financing Receivable Troubled Debt Restructuring [Member]
Commercial:
Allowance for losses, troubled debt restructurings	455,000	528,000
Commercial Real Estate Non Owner Occupied Loan [Member] | Financing Receivable Troubled Debt Restructuring [Member]
Commercial:
Allowance for losses, troubled debt restructurings	7,236,000	7,828,000
Commercial Real Estate Multi Family And Residential Rental Loan [Member] | Financing Receivable Troubled Debt Restructuring [Member]
Commercial:
Allowance for losses, troubled debt restructurings	304,000	1,010,000
Commercial [Member] | Financing Receivable Troubled Debt Restructuring [Member]
Commercial:
Allowance for losses, troubled debt restructurings	8,785,000	10,351,000
Home Equity and Other [Member] | Financing Receivable Troubled Debt Restructuring [Member]
Commercial:
Allowance for losses, troubled debt restructurings	0	0
Retail 1-4 Family Mortgages [Member] | Financing Receivable Troubled Debt Restructuring [Member]
Commercial:
Allowance for losses, troubled debt restructurings	32,000	0
Retail [Member] | Financing Receivable Troubled Debt Restructuring [Member]
Commercial:
Allowance for losses, troubled debt restructurings	32,000	0
Financing Receivable Troubled Debt Restructuring [Member]
Commercial:
Allowance for losses, troubled debt restructurings	$ 8,817,000	$ 10,351,000