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Note 2 - Reinstatement of the Biodiesel Blenders' Tax Credit and Small Agri-biodiesel Producer Tax Credit (Details Textual)
gal in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
gal
Biodiesel Blenders Credit [Member]    
Benefit From Tax Credit, Pretax $ 28,869,000  
Income Tax Credits and Adjustments 42,428,000  
Biodiesel Blenders Credit [Member] | Owed to Customers [Member]    
Income Tax Credits and Adjustments $ 13,559,000  
Small Agri Biodiesel Producers Credit [Member]    
Tax Credit Per Gallon Of Agri Biodiesel Sold   $ 0.10
Number of Gallons Sold | gal   15