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Note 9 - Segment Information (Tables)
3 Months Ended
Mar. 31, 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

 

March 31, 2014

  $ 79,928     $ 2,269     $ 82,197  

March 31, 2013

  $ 87,978     $ 4,187     $ 92,165  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   

For the three months

ended March 31,

 
   

2014

   

2013

 

Revenues

               

Chemicals

  $ 30,276     $ 40,136  

Biofuels

    51,921       52,029  

Revenues

  $ 82,197     $ 92,165  
                 

Segment gross profit

               

Chemicals

  $ 9,034     $ 13,066  

Biofuels

    568       8,315  

Segment gross margins

    9,602       21,381  

Corporate expenses

    (2,151

)

    (2,431

)

Income before interest and taxes

    7,451       18,950  

Interest and other income

    2,551       1,212  

Interest and other expense

    (6

)

    (6

)

Provision for income taxes

    (3,722

)

    (6,106

)

Net income

  $ 6,274     $ 14,050