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12. Stock-Based Compensation (Details 1) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Number of Outstanding, Ending 7,524,834 6,803,701
Weighted Average Exercise Price Outstanding, Ending $ 0.59 $ 0.94
Remaining Contractual Term (In Years) 3 years 7 days 2 years 4 months 13 days
Average Intrinsic Value $ 2,517,107 [1] $ 2,431,828 [1]
Unvested Options
    
Number of Outstanding, Ending 2,462,984 843,585
Weighted Average Exercise Price Outstanding, Ending $ 0.52 $ 0.17
Remaining Contractual Term (In Years) 4 years 8 months 8 days 3 years 1 month 28 days
Average Intrinsic Value 435,197 [1] 445,606 [1]
Vested Options
    
Number of Outstanding, Ending 5,061,850 5,960,116
Weighted Average Exercise Price Outstanding, Ending $ 0.63 $ 1.05
Remaining Contractual Term (In Years) 2 years 2 months 16 days 2 years 3 months 4 days
Average Intrinsic Value $ 2,081,910 [1] $ 1,986,222 [1]
[1] (1) Intrinsic value calculation based on the $0.70 closing price of Aemetis stock on December 31, 2012 and 2011, as reported on the Over the Counter Bulletin Board.