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Note 9 - Securities Sold Under Agreements to Repurchase (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure Text Block [Abstract]  
Schedule of Repurchase Agreements [Table Text Block]
   

2015

    

2014

  
             

Outstanding balance at year-end

   $ 154,771,000     $ 167,569,000  

Weighted average interest rate at year-end

     0.11 %     0.11 %
                 

Average daily balance during the year

   $ 146,826,000     $ 105,474,000  

Weighted average interest rate during the year

     0.11 %     0.12 %
                 

Maximum daily balance during the year

   $ 168,211,000     $ 178,042,000