Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) - Troubled Debt Restructurings Subsequently Defaulted (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Financing Receivable, Modifications [Line Items]
Number of contracts	0	0
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts			6
Recorded investment			$ 248
Residential Real Estate Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts			1
Recorded investment			68
Commercial Real Estate Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts			1
Recorded investment			$ 5