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Note 2 - Inventory (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30, 2016
   
December 31, 2015
 
At average cost (approximates current cost)
               
Finished goods
  $ 26,892     $ 35,517  
Work in process
    2,039       1,695  
Raw materials and supplies
    31,031       31,247  
      59,962       68,459  
LIFO reserve
    (1,245 )     (3,502 )
Total inventory
  $ 58,717     $ 64,957