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Note 2 - Inventory (Tables)
3 Months Ended
Mar. 31, 2014
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
   

March 31,

2014

   

December 31,

2013

 

At average cost (approximates current cost)

               

Finished goods

  $ 20,601     $ 13,590  

Work in process

    2,265       1,569  

Raw materials and supplies

    29,137       36,292  
      52,003       51,451  

LIFO reserve

    (9,520

)

    (9,287

)

Total inventory

  $ 42,483     $ 42,164