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Note 14 - Dividends and Dividend Equivalents (Tables)
 6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Dividends Payable [Table Text Block]
 
 
Dividend Declared
per Share
 
 
Total
Amount
 
2016:
 
 
 
 
 
 
 
 
First quarter
   $ 0.20     $ 8,047  
Second quarter
  $ 0.20     $ 8,096  
                 
2015:
 
 
 
 
 
 
 
 
First quarter
   $ 0.20     $ 7,854  
Second quarter
   $ 0.20     $ 7,925