Note 9 - Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Commitments to Extend Credit and Standby Letters of Credit [Member]
Note 9 - Commitments and Contingent Liabilities (Details) [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability	$ 574,600	$ 463,000
Standby Letters of Credit [Member]
Note 9 - Commitments and Contingent Liabilities (Details) [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability	11,000	$ 11,000
Unfunded Commitments Inherit Risk [Member]
Note 9 - Commitments and Contingent Liabilities (Details) [Line Items]
Loss Contingency Accrual	$ 372
Minimum [Member] | Standby Letters of Credit [Member]
Note 9 - Commitments and Contingent Liabilities (Details) [Line Items]
Guarantee Obligations Agreement Term	1 year
Maximum [Member] | Standby Letters of Credit [Member]
Note 9 - Commitments and Contingent Liabilities (Details) [Line Items]
Guarantee Obligations Agreement Term	2 years