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Note 14 - Contingent Consideration (Details Textual) - USD ($) $ in Thousands				3 Months Ended		6 Months Ended		12 Months Ended	48 Months Ended
	Sep. 30, 2024	Aug. 01, 2024	Oct. 01, 2020	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2024
Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease)				$ 0	$ (500)	$ 0	$ 3,400
Northeast Power Systems, Inc (NEPSI) [Member]
Payments to Acquire Businesses, Gross			$ 26,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)			873,657					399,999
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High, Number of Shares (in shares)			1,000,000
Business Combination, Contingent Consideration Arrangements, Number of Issuable Shares (in shares)	300,000				300,000		300,000	300,000	300,000
Business Combination, Separately Recognized Transactions, Revenues and Gains Recognized									$ 120,000
Megatran [Member]
Payments to Acquire Businesses, Gross		$ 30,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)		1,297,600
Business Combination, Consideration Transferred		$ 61,400
Business Combination, Contingent Consideration Arrangements, Payments to Settle Remaining Obligations	$ 3,300
Business Combination, Contingent Consideration Arrangements, Remaining Obligation to Stockholders	$ 0				$ 0		$ 0		$ 0

X

- Definition

The number of issuable shares for contingent consideration arrangements under business combinations.

+ References

No definition available.

+ Details

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Namespace Prefix:	amsc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the payments to settle remaining obligations from a contingent consideration arrangement resulting from a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	amsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid in shares.

+ References

No definition available.

+ Details

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X

- Definition

Represents the remaining obligation to stockholders from a contingent consideration arrangement from a business combination.

+ References

No definition available.

+ Details

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X

- Definition

Number of shares of equity interest issued or issuable by acquirer as part of consideration transferred in business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 10
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X

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

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X

- Definition

Amount of increase (decrease) in value of liability in contingent consideration arrangement in business combination, including, but not limited to, difference arising upon settlement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
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X

- Definition

The revenues and gains recognized recorded for each transaction with the acquiree that is recognized separately from the acquisition of assets and assumptions of liabilities in the business combination.

+ References

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X

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

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