Note 19 - Related Party Transactions (Tables)
12 Months Ended
Dec. 31, 2015
Related Party Transactions [Abstract]  
Condensed Balance Sheet [Table Text Block]
   

2015

   

2014

 

Accounts receivable

               

Biodiesel, petrodiesel, blends and other petroleum products

  $ 10     $ 1,173  

Total accounts receivable

  $ 10     $ 1,173  

Prepaid expenses

               

Administrative services and other

  $ 35     $ -  

Total prepaid expenses

  $ 35     $ -  

Accounts payable

               
Natural gas and fuel purchases   $ 233     $ 2,912  

Travel and administrative services

  $ 11     $ -  

Total accounts payable

  $ 244     $ 2,912  

Accrued liabilities

               

Travel and administrative services

  $ -     $ 46  

Total accrued liabilities

  $ -     $ 46  
Condensed Income Statement [Table Text Block]
   

For the years ended December 31:

 
                         
   

2015

   

2014

   

2013

 

Revenues

                       

Biodiesel, petrodiesel, blends and other petroleum products

  $ 64,981     $ 39,090     $ 9,420  

Total revenues

  $ 64,981     $ 39,090     $ 9,420  

Cost of goods sold

                       

Biodiesel, petrodiesel, blends, and other petroleum products

  $ 2,412     $ 51,647     $ 44,548  

Natural gas purchases

    4,190       7,095       6,007  

Income tax, consulting services and other

    60       80       80  

Total cost of goods sold

  $ 6,662     $ 58,822     $ 50,635  

Distribution

                       

Distribution and related services

  $ 405     $ 335     $ 392  

Total distribution

  $ 405     $ 335     $ 392  

Selling, general and administrative expenses

                       

Commodity trading advisory fees

  $ 143     $ 132     $ 132  

Travel and administrative services

    72       82       267  

Total selling, general, and administrative expenses

  $ 215     $ 214     $ 399