Note 12 - Accounts Payable and Accrued Expenses (Details Textual)	12 Months Ended
Mar. 31, 2026
Minimum [Member]
Extended Warranty Trigger Period (Year)	1 year
Maximum [Member]
Extended Warranty Trigger Period (Year)	3 years

The period in which customers may extend their warranty for an additional term.

No definition available.

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