Note 3 - Revenue Recognition 1 (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue, Performance Obligation Satisfied, Revenue Recognized, Percentage		90.00%	90.00%	89.00%
Revenue from Contract with Customer, Products on Hold	$ 7,900	$ 0	$ 7,900	$ 0
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

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

No definition available.

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

Represents the additional term of extended service-type warranties.

No definition available.

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

Amount of revenue collected from customer for products currently on hold.

No definition available.

Name:	amsc_RevenueFromContractWithCustomerProductsOnHold
Namespace Prefix:	amsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

No definition available.

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

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

No definition available.

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

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