Note 5 - Loans (Details) - Activity in the Allowance for Credit Losses (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Note 5 - Loans (Details) - Activity in the Allowance for Credit Losses [Line Items]
Provision/(reversal) for possible loan losses	$ (2,000)	$ (5,100)	$ (3,700)	$ (3,000)	$ (10,800)	$ (3,000)	$ (9,000)
Transfers (to)/from reserve for off-balance sheet credit commitments					(372)		706
Loans charged off					(22,235)	(20,442)	(32,791)
Recoveries of charged off loans					20,938	14,009	18,127
Reserve for Off-Balance Sheet Credit Commitments [Member] | Beginning of Period [Member]
Note 5 - Loans (Details) - Activity in the Allowance for Credit Losses [Line Items]
Balance	1,363				1,363	1,363	2,069
Reserve for Off-Balance Sheet Credit Commitments [Member] | End of Period [Member]
Note 5 - Loans (Details) - Activity in the Allowance for Credit Losses [Line Items]
Balance	1,949				1,949	1,363	1,363
Reserve for Off-Balance Sheet Credit Commitments [Member]
Note 5 - Loans (Details) - Activity in the Allowance for Credit Losses [Line Items]
Provision/(reversal) for possible loan losses					586		(706)
Beginning of Period [Member]
Note 5 - Loans (Details) - Activity in the Allowance for Credit Losses [Line Items]
Balance								206,280
Balance						173,889	183,322	206,280
End of Period [Member]
Note 5 - Loans (Details) - Activity in the Allowance for Credit Losses [Line Items]
Balance	$ 161,420				$ 161,420	$ 173,889	$ 183,322