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Note 9 - Segment information (Tables)
6 Months Ended
Jun. 30, 2013
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, 2013

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

June 30, 2012

  $ 100,262     $ 2,975     $ 103,237  

Six Months Ended

 

United States

   

All Foreign Countries

   

Total

 

June 30, 2013

  $ 190,879     $ 7,349     $ 198,228  

June 30, 2012

  $ 181,406     $ 7,558     $ 188,964  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   

For the three months ended June 30,

   

For the six months ended June 30,

 
   

2013

   

2012

   

2013

   

2012

 

Revenues

                               

Chemicals

  $ 42,026     $ 40,893     $ 82,162     $ 79,302  

Biofuels

    64,037       62,344       116,066       109,662  

Revenues

  $ 106,063     $ 103,237     $ 198,228     $ 188,964  
                                 

Segment gross profit

                               

Chemicals

  $ 14,784     $ 11,249     $ 27,850     $ 22,918  

Biofuels

    12,842       3,151       21,157       4,283  

Segment gross margins

    27,626       14,400       49,007       27,201  

Corporate expenses

    (2,651 )     (2,828 )     (5,082 )     (5,046 )

Income before interest and taxes

    24,975       11,572       43,925       22,155  

Interest and other income

    3,719       1,243       4,931       2,529  

Interest and other expense

    (40 )     (125 )     (46 )     (15 )

Provision for income taxes

    (10,498 )     (4,217 )     (16,604 )     (9,083 )

Net income

  $ 18,156     $ 8,473     $ 32,206     $ 15,586