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Note 8 - Outstanding Warrants (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Warrants and Rights Outstanding, Term (Year) 7 years 5 months 23 days 3 years 11 months 12 days 4 years 11 months 12 days
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 15.92 $ 2.59 $ 2.59
Class of Warrant or Right, Outstanding (in shares) 355,000 55,000 95,000
Warrants Issued with Extension of Notes [Member]      
Warrants and Rights Outstanding $ 227 $ 227  
Warrants and Rights Outstanding, Term (Year) 2 years    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.01    
Warrants Issued to Obtain Lines of Credit [Member]      
Class of Warrant or Right, Outstanding (in shares) 300,000    
Five Year Warrants in Connection With New Credit Facility [Member]      
Warrants and Rights Outstanding, Term (Year) 5 years    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 10.20    
Class of Warrant or Right, Outstanding (in shares) 50,000    
Ten Year Warrants in Connection With New Credit Facility [Member]      
Warrants and Rights Outstanding, Term (Year) 10 years    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 20.00    
Class of Warrant or Right, Outstanding (in shares) 250    
Aemetis Carbon Capture, Inc. Carbon Sequestration Project [Member]      
Class of Warrant or Right, Granted (in shares) 65,000