XML 16 R55.htm IDEA: XBRL DOCUMENT v2.4.0.6

Warrants And Derivative Liabilities (Schedule Of The Fair Value Of The Warrants Using The Black-Scholes Option Pricing Model - Loan And Security Agreement) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended		3 Months Ended	6 Months Ended	0 Months Ended	1 Months Ended	6 Months Ended	9 Months Ended
	Dec. 31, 2012	Apr. 04, 2012	Jun. 30, 2012	Sep. 30, 2012	Jun. 05, 2012 Loan And Security Agreement [Member]	Jun. 30, 2012 Loan And Security Agreement [Member]	Sep. 30, 2012 Loan And Security Agreement [Member]	Dec. 31, 2012 Loan And Security Agreement [Member]
Derivative [Line Items]
Risk free interest rate	0.23%	0.44%	0.33%	0.23%	0.77%	0.80%	0.64%	0.75%
Expected annual dividend yield	16.50%	15.00%	16.00%	15.00%	0.00%	0.00%	0.00%	0.00%
Expected volatility	73.50%	75.00%	71.00%	70.00%	79.90%	80.32%	81.18%	80.14%
Term (years)	1 year 9 months 4 days	2 years 6 months	2 years 3 months 11 days	2 years 4 days	5 years 6 months	5 years 5 months 9 days	5 years 2 months 5 days	4 years 11 months 5 days
Fair Value					$ 0.4	$ 0.5	$ 0.4	$ 0.2

X

- Definition

Warrant Instruments, Fair Value Disclosure.

+ References

No definition available.

+ Details

Name:	amsc_WarrantInstrumentsFairValueDisclosure
Namespace Prefix:	amsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueAssumptionsExpectedDividendRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueAssumptionsExpectedTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueAssumptionsExpectedVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueAssumptionsRiskFreeInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration