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5. Notes Payable (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
For the twelve months ending
2016	$ 12,138us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
2017	61,879us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
2018	3,160us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
2019	17,500us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
Total debts	94,677us-gaap_LongTermDebt
Discounts	(1,779)AMTX_Discounts
Total debt, net of discounts	$ 92,898AMTX_TotalDebtNetOfDiscounts

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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