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Note 2 - Inventory (Tables)
6 Months Ended
Jun. 30, 2013
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
   

June 30, 2013

   

December 31, 2012

 

At average cost (approximates current cost)

               

Finished goods

  $ 24,346     $ 15,803  

Work in process

    1,320       1,304  

Raw materials and supplies

    38,545       37,086  
      64,211       54,193  

LIFO reserve

    (13,585 )     (12,201 )

Total inventory

  $ 50,626     $ 41,992