XML 35 R31.htm IDEA: XBRL DOCUMENT v2.4.0.8

10. Stock Based Compensation (Tables)

6 Months Ended

Jun. 30, 2014

Stock Based Compensation Tables

Schedule of options granted under employee stock plans

Six months ended		Shares Available for Grant				Number of Shares Outstanding				Weighted-Average Exercise Price
Balance as of December 31, 2013			74				913			$	4.90
Authorized			100				—				—
Granted			(148	)			148				4.20
Exercised			—				(144	)			1.60
Forfeited/expired			65				(65	)			2.69
Balance as of June 30, 2014			91				852			$	5.56

Schedule of weighted average fair value calculations for options

		As of June 30
		2014			2013
Dividend-yield		0	%		0		%
Risk-free interest rate		0. 44 - 0.74	%		0.18 - 0.42		%
Expected volatility		69.33 - 82.28	%		74.83 - 142.90		%
Expected life (years)		0.8 - 3.0				0.5 - 3.0
Market value of common stock	$	4.20 - $ 9.54			$	3.20

X

- Definition

Custom Element.

+ References

No definition available.

+ Details

Name:	AMTX_ScheduleOfWeightedAverageFairValueCalculationsForOptions
Namespace Prefix:	AMTX_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	AMTX_StockBasedCompensationTablesAbstract
Namespace Prefix:	AMTX_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration