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Note 12 - Employee Benefits (Tables)
12 Months Ended
Dec. 31, 2012
Schedule of Employee Stock Ownership Plan (ESOP) Disclosures [Table Text Block]
   
Years ended December 31
 
   
2012
   
2011
   
2010
 
                   
Number of shares issued
    32,765       26,500       16,047  
                         
Fair value of stock contributed
  $ 617     $ 497     $ 315  
                         
Cash contributed
    82       65       105  
                         
Total expense
  $ 699     $ 562     $ 420