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Goodwill And Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill Attributable to Each Business Segment) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2018
Goodwill [Line Items]      
Goodwill, Beginning Balance [1]   $ 34,689,000  
Impairment charge $ 0 (24,091,000)  
Goodwill, Ending Balance [1]   10,598,000  
Goodwill   10,598,000 [1] $ 34,689,000
Ethanol Production [Member]      
Goodwill [Line Items]      
Goodwill, Beginning Balance [1]   24,091,000  
Impairment charge   (24,091,000)  
Goodwill, Ending Balance [1]    
Goodwill   24,091,000 [1] 24,091,000
Green Plains Partners [Member]      
Goodwill [Line Items]      
Goodwill, Beginning Balance [1]   10,598,000  
Impairment charge    
Goodwill, Ending Balance [1]   10,598,000  
Goodwill   $ 10,598,000 [1] $ 10,598,000
[1] The company records goodwill within other assets on the consolidated balance sheets.