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Note 4 - Revenue Recognition 1 (Details Textual)	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenue, Performance Obligation Satisfied, Revenue Recognized, Percentage	88.00%	80.00%
Minimum [Member]
Warranty Period (Year)	1 year
Contract with Customer, Payment Term (Day)	30 days
Maximum [Member]
Warranty Period (Year)	3 years
Extended Service Warranty, Term (Year)	4 years
Contract with Customer, Payment Term (Day)	60 days

X

- Definition

Represents the payment term, from the date of delivery, under contracts with customers.

+ References

No definition available.

+ Details

Name:	amsc_ContractWithCustomerPaymentTerm
Namespace Prefix:	amsc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the additional term of extended service-type warranties.

+ References

No definition available.

+ Details

Name:	amsc_ExtendedServiceWarrantyTerm
Namespace Prefix:	amsc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the percentage of revenue recognized at the point of time when control transferred to the customer.

+ References

No definition available.

+ Details

Name:	amsc_RevenuePerformanceObligationSatisfiedRevenueRecognizedPercentage
Namespace Prefix:	amsc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the typical term of assurance-type warranties on all product sales.

+ References

No definition available.

+ Details

Name:	amsc_WarrantyPeriod
Namespace Prefix:	amsc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: