Note 7 - Loans (Details)	3 Months Ended
	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Note 7 - Loans (Details) [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 134,815,000	$ 133,810,000
Percentage of Charge-off to Contractual Balances for Impaired Loans	14.20%	22.40%
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0
Loans and Leases Receivable, Impaired, Commitment to Lend		$ 0
Nonaccrual Loans [Member]
Note 7 - Loans (Details) [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 44,600,000	52,100,000
Financing Receivable, Modifications, Recorded Investment	23,200,000	39,900,000
Allowance for Credit Losses, Change in Method of Calculating Impairment	5,300,000	2,000,000
Accruing Troubled Debt Restructuring [Member]
Note 7 - Loans (Details) [Line Items]
Impaired Financing Receivable, Recorded Investment	90,200,000	81,700,000
Financing Receivable, Modifications, Recorded Investment	90,200,000	81,700,000
Allowance for Credit Losses, Change in Method of Calculating Impairment	$ 1,500,000	$ 5,400,000
Minimum [Member]
Note 7 - Loans (Details) [Line Items]
Period Loan is in Payment Default	60 days
Minimum [Member] | Rate Reduction [Member]
Note 7 - Loans (Details) [Line Items]
Troubled Debt Restructurings Length of Modifications	6 months
Maximum [Member]
Note 7 - Loans (Details) [Line Items]
Period Loan is in Payment Default	90 days
Maximum [Member] | Rate Reduction [Member]
Note 7 - Loans (Details) [Line Items]
Troubled Debt Restructurings Length of Modifications	3 years