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Note 22 - Segment Information (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Twelve months ended
  
   
2019
    
2018
    
2017
  
Revenue
                        
Custom chemicals
   $
90,962
     $
97,746
     $
87,905
  
Performance chemicals
    
13,865
      
19,382
      
17,481
  
Chemicals revenue
    
104,827
      
117,128
      
105,386
  
Biofuels revenue
    
100,399
      
173,890
      
169,640
  
Total Revenue
   $
205,226
     $
291,018
     $
275,026
  
                         
Segment gross profit (loss)
                        
Chemicals
   $
29,923
     $
33,986
     $
28,016
  
Biofuels
    
44,216
      
39,412
      
(7,755
 )
Total gross profit
   $
74,139
     $
73,398
     $
20,261