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Note 9 - Segment Information (Tables)
6 Months Ended
Jun. 30, 2014
Segment Reporting [Abstract]  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

Three Months Ended

 

United States

   

All Foreign

Countries

   

Total

 

June 30, 2014

  $ 66,461     $ 1,578     $ 68,039  

June 30, 2013

  $ 102,901     $ 3,162     $ 106,063  

Six Months Ended

 

United States

   

All Foreign

Countries

   

Total

 

June 30, 2014

  $ 146,389     $ 3,848     $ 150,236  

June 30, 2013

  $ 190,879     $ 7,349     $ 198,228  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
    For the three months ended
June 30,
 
    For the six months ended
 June 30,
 
 
   

2014

   

2013

   

2014

   

2013

 

Revenues

                               

Chemicals

  $ 32,609     $ 42,026     $ 62,885     $ 82,162  

Biofuels

    35,430       64,037       87,351       116,066  

Revenues

  $ 68,039     $ 106,063     $ 150,236     $ 198,228  
                                 

Segment gross profit

                               

Chemicals

  $ 7,131     $ 14,784     $ 16,165     $ 27,850  

Biofuels

    (553 )     12,842       15       21,157  

Segment gross margins

    6,578       27,626       16,180       49,007  

Corporate expenses

    (2,407 )     (2,651 )     (4,558 )     (5,082 )

Income before interest and taxes

    4,171       24,975       11,622       43,925  

Interest and other income

    4,516       3,719       7,003       4,931  

Interest and other expense

    (71 )     (40 )     (13 )     (46 )

Provision for income taxes

    (3,269 )     (10,498 )     (6,991 )     (16,604 )

Net income

  $ 5,347     $ 18,156     $ 11,621     $ 32,206