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Note 6 - Mortgage Loan Servicing (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Mortgage Loan Servicing [Abstract]    
Continuing Involvement With Transferred Financial Assets Custodial Escrow Balance $ 3.0 $ 2.8
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance 0.0 0.0
Servicing Asset at Fair Value, Amount $ 7.8 $ 7.3
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 7.10% 7.05%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 11.70% 12.60%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Expected Credit Losses 0.90% 1.01%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Weighted Average Life 3 years 219 days 3 years 255 days